José Luis Guzmán Guerrero
Huelva University, Agroforestry Science, Faculty Member
- I hold a Licensed (1987) and a PhD of Veterinary Medicine (1992), awarded by the University of Córdoba. In 1994, and ... moreI hold a Licensed (1987) and a PhD of Veterinary Medicine (1992), awarded by the University of Córdoba. In 1994, and after two years working in such institution as an Acting Assistant Professor, I joined the University of Huelva in the same position. Only one year later I was promoted to Assistant Professor in the Area of Animal Production within the Agroforestry Science Department (School of Engineering); my current position. In 2023 I was appointed Full Professor (position I currently hold) in the same Area and Department. During this period, I have been teaching diverse courses included in the Degree of Agricultural Engineering. Besides, I have also been responsible for the interuniversity PhD programme entitled “Animal husbandry and sustainable management: ovine and caprine” and the Master entitled “Animal husbandry and sustainable management: organic stockbreeding”. I have also been responsible for a teaching innovation project.
It is also worth noting that he has held the position of Vice-Rector of Planning and Infrastructure from 1997 to 2001; in addition to having been part of several Commissions, Cloisters, etc.
My research experience began as part of the Genetics Department at the University of Córdoba, in which I developed my Bachelor Dissertation. Later, I joined the School of Agricultural Engineering at the same University to follow a PhD scholarship. Thanks to these opportunities, I have been a member of the “Animal Husbandry” research group, University of Córdoba. Finally, and since 1997, I am the Research Leader of the “Animal Production Technology” research group (AGR233 of PAIDI) at the University of Huelva. Throughout this time, I have been involved in 26 R&D projects and 13 agreements, contracts and transfer projects with various public entities and institutions and with the private sector; all related to the Agri-Food sector. For instance, the main research topics I have worked on are nutritional assessment of agro-industrial by-products, characterization of goat production systems, assessment of milk and meat quality in goats and animal reproduction (seasonality and seminal quality). As a result of this research, 57 scientific papers in JCR indexed journals should be highlighted, 14 papers published in other journals (including scientific dissemination), 10 book chapters and books, in addition to 48 international congress communications and 28 to national congresses. I have also contributed to the training of new doctors with the co-direction of 5 Doctoral Theses. The main results to be highlighted are the optimization of the ammonia treatment of cereal straws to increase its nutritional value, the characterization of some goat production systems in Andalusia and to publicize the characteristics of the carcass, meat and milk quality of some autochthonous goat breeds; both in conventional and ecological production. Concerning animal reproduction sciences, we have characterized the reproductive seasonality in different Spanish autochthonous goat breeds as well as its control using the feeding, melatonin implants, artificial photoperiod, and male effect in diverse situations. The neuroendocrine mechanisms involved in reproductive seasonality have also been established. In the medium/long term, the objective is to find alternative methods to the use of exogenous hormones for the control of goat reproduction and to continue with the study of the effect of the use of some agro-industrial by-products on the quality of animal products.
General indicators of quality of scientific production: 3 recognized periods of research (date of the last: 06/06/2018), 3 Thesis supervised in the last 10 years (2013-2022), 713 total citations Web of Science (WOS), 66 average citations during the last five years (2018-2022), 27 total publications in the first quartile (Q1) (until 2022) and 15 of h-index (WOS).
Among other contributions, I am a member of the Editorial boards of Archivos de Zootecnia, Guest Editor of a special issue of Animals, entitled "Improving the Nutrition of Small Ruminants for a Sustainable Animal Performance and Product Quality", Specialist in animal welfare, designated veterinarian and in- situ responsible for compliance with RD 53/2013, Member of Ethics Committee of Animal Experimentation of University of Huelva, I have 5 Educational recognized periods and 5 recognized stretches (maximum allowed) of Evaluation of the teaching, research and management activity of the teaching and research staff of the Public Universities of Andalusia.edit
Background: The increasingly aquaculture development have favored the searching of new protein sources for fish feeding. Goals: 1) trying to present the first data on the culture of an important commercial species in Ecuador, 2) replacing... more
Background: The increasingly aquaculture development have favored the searching of new protein sources for fish feeding. Goals: 1) trying to present the first data on the culture of an important commercial species in Ecuador, 2) replacing the protein source for feeding in order to minimize the global problem of the fish-based meals in aquaculture. Methods: Guayas cichlid juvenile fish were submitted to 4 feeding treatments: 0%, 4%, 8% and 12% palm cake replacement for 30 days. Several zootechnnical indexes were calculated and analyzed at the end of the experimental culture, as well as the feed proximal composition. Results: The inclusion up to 8% palm cake did not affect the digestibility coefficients of dry matter, gross protein or gross energy. No differences were found in final weight, growth rate, food conversion rate, protein efficiency rate and productive value of the protein among 0, 4 and 8% palm meal content treatments. As the percentage of palm kernel meal in the die...
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One experiment was conducted to determine if the onset of the reproductive activity and semen production could be modified by a previous treatment with exogenous melatonin, used to enhance reproductive activity during the seasonal... more
One experiment was conducted to determine if the onset of the reproductive activity and semen production could be modified by a previous treatment with exogenous melatonin, used to enhance reproductive activity during the seasonal anoestrous in Mediterranean bucks. Two balanced groups of bucks were used. The 18th march 2005, one group (M group) received 3 s.c. implants of melatonin (N=7) and other group (N=4) was used like control (C group). From June to September, body weight and testosterone was measured weekly and testicular weight every 15 days. The reproductive activity of each buck was assessed using characteristics of the testosterone profile. During the first 8 days of each month, volume of ejaculate and sperm concentration was assessed. Each of these 8-d periods was divided into 3-d periods of daily sperm collection separated by 2 d of rest. The semen was collected using an artificial vagina. The effect of treatment and month was studied on each variable. An interaction, mo...
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We conducted the first nutritional analysis of dairy products from the traditional Roja Mallorquina sheep breed. Samples of bulk raw milk were taken twice a month from December 2015 to March 2016 from sheep fed using a part-time grazing... more
We conducted the first nutritional analysis of dairy products from the traditional Roja Mallorquina sheep breed. Samples of bulk raw milk were taken twice a month from December 2015 to March 2016 from sheep fed using a part-time grazing system, and fresh soft (FC, n = 8) and ripened (RC, n = 8) cheeses were made. The variability in vitamins, total phenolic compounds (TPC), total antioxidant capacity (TAC), and fatty acid (FA) content was influenced by the cheese-making process (differences between the cheese and the original milk) and by the type of cheese-making technology (mainly related to heating, the use of starter culture, and ripening). The most notable physicochemical characteristic of the cheeses was low fat content (24.1 and 29.6 g/100 g for FC and RC). Milk and RC were characterised by major concentrations of retinol (211.4 and 233.6 μg/100 g dry matter (DM), respectively) and TPC (18.7 and 54.6 μg/100 g DM, respectively), while FC was characterised by major concentration...
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The increased use of concentrates to reduce pasture as a feed source in productive systems like Payoya breed goat farms has made it necessary to decrease feeding costs. The inclusion of agro-industry by-products such as dry orange pulp... more
The increased use of concentrates to reduce pasture as a feed source in productive systems like Payoya breed goat farms has made it necessary to decrease feeding costs. The inclusion of agro-industry by-products such as dry orange pulp pellets in goat diets has been suggested as a sustainable alternative to cereal-based concentrates. The aim of this work was to assess the influence of diets including dry orange pulp pellets on the quality of cheeses traditionally made from Payoya breed goat milk. We analysed the physicochemical characteristics, sensory properties and volatile compound profiles of 18 artisanal cheeses made from raw Payoya milk. In this study, goats were fed with different concentrations of dry orange pulp; and cheeses were curdled with animal and vegetable coagulants. Slight differences were detected between some cheeses. However, the use of citrus by-products in the Payoya goat diets did not substantially affect the cheeses’ physicochemical properties, olfactory att...
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Although dried orange pulp (DOP) may conveniently replace cereals in ruminant diets, few studies have considered similar diet substitution for goats. We hypothesised that DOP could replace cereal-based concentrate in goat diets without... more
Although dried orange pulp (DOP) may conveniently replace cereals in ruminant diets, few studies have considered similar diet substitution for goats. We hypothesised that DOP could replace cereal-based concentrate in goat diets without detrimental effects on growth performance and carcass quality of suckling kids and milk performance and blood biochemical parameters of dams in early lactation. We also hypothesised that DOP substitution may increase the levels of antioxidants, such as phenolic compounds and vitamin E, in milk and improve its total antioxidant capacity (TAC). Therefore, 44 primiparous Payoya dairy goats were allocated to three experimental groups, each fed a different diet: control (CD, n = 14) based on a commercial concentrate with alfalfa hay as forage; and DOP40 (n = 16) in which 40% and DOP80 (n = 14) in which 80% of the cereal in the concentrate were replaced by DOP. The experiment lasted from the final month of pregnancy to 55 days postpartum. The DOP diets did ...
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The viability of conventional goat farms, such as the native Payoya dairy goat, could be improved by switching to organic production, but product quality needs to be ensured. The present work assesses the carcass and meat quality of... more
The viability of conventional goat farms, such as the native Payoya dairy goat, could be improved by switching to organic production, but product quality needs to be ensured. The present work assesses the carcass and meat quality of Payoya kids raised under conventional and organic grazing-based systems. Twenty-four kids (12 males, 12 females) were selected from each system (n = 48). The slaughter live weight (8.52 vs. 8.28 kg), cold carcass weight (4.44 vs. 4.29 kg) and farm dressing percentage (51.7 vs. 50%) of the conventionally raised kids were significantly higher than those of the organic kids. The shoulder (first category) (21.7 vs. 22.3%) and long leg (32 vs. 32.9%) percentages were lower in the conventional than in the organic kids. The percentage contribution of the intermuscular fat (10.70 vs. 8.11%) to the shoulder weight was greater in the conventional kids, while the percentages of muscle (59.7 vs. 57.2%) and bone (24.7 vs. 22.8%) were higher in the organic kids. For t...
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This paper compares the effects of exposure to exogenous melatonin (MEL), short days (SD, 8h of light) and long days (LD, 16h of light), on reproductive activity, sperm motility and other reproductive variables, in Blanca Andaluza bucks.... more
This paper compares the effects of exposure to exogenous melatonin (MEL), short days (SD, 8h of light) and long days (LD, 16h of light), on reproductive activity, sperm motility and other reproductive variables, in Blanca Andaluza bucks. Fourteen males were spilt into two groups of seven animals (G1 and G2). They were subjected to five alternations of 2 months of LD followed by 2 months of SD or MEL before the experimental period of three consecutive intervals of: (1) 2 months of SD (G1, N=7) or MEL (G2, N=7); (2) 2 months of LD (G1+G2, N=14); and (3) 2 months of SD (G2, N=7) or MEL (G1, N=7). Plasma testosterone concentration, live weight, testicular weight and fresh semen quality were determined weekly. Semen was also cooled and frozen-thawed every fortnight, and the same quality variables measured as for fresh sperm. When the bucks were under LD treatment, the testosterone concentration was lower than when under MEL or SD treatment (P<0.01); values for the semen concentration ...
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This study analysed the effect of level of nutrition and date of birth (age) on the onset of puberty in Payoya she-kids born in autumn (November) or in winter (February). Two experiments were conducted to examine pubertal events at the... more
This study analysed the effect of level of nutrition and date of birth (age) on the onset of puberty in Payoya she-kids born in autumn (November) or in winter (February). Two experiments were conducted to examine pubertal events at the onset of puberty. For each date of birth (age), two experimental groups were used, differing on the level of nutrition. Groups were balanced for live weight (LW) and body condition score (BCS). For the first experiment (goat kids born in autumn), 27 Payoya she-kids were used: high-nutrition group (H1,n= 13) and control group (C1,n= 14). For the second experiment (goat kids born in winter), 25 Payoya she-kids were used: high-nutrition group (H2,n= 13) and control group (C2,n= 12). In both experiments, the level of feeding was adjusted weekly according to LW so that the animals would gain about 50 and 100 g per day for C and H groups, respectively. Oestrus was tested daily using young aproned bucks. Ovulation rate was assessed by laparoscopy 7 days afte...
Research Interests: Nutrition, Biology, Medicine, Biological Sciences, Seasonality, and 6 moreAnimal, Goat, Puberty, Female, Cambridge University, and Season
One experiment was conducted to determine whether the treatment with artificial long days and exogenous melatonin can induce reproductive activity during spring (seasonal anoestrus) in Mediterranean goats that are in daily contact with... more
One experiment was conducted to determine whether the treatment with artificial long days and exogenous melatonin can induce reproductive activity during spring (seasonal anoestrus) in Mediterranean goats that are in daily contact with bucks and whether this treatment causes a variation in the reactivation of the reproductive activity in the normal breeding season. The experiment started on 4 November 2005 and finished on 27 October 2006. Thirty-four adult and barren does were used, distributed into two groups balanced according to their live weight (LW) and body condition score (BCS). Seventeen females were exposed to long days (16 h of light/day) from 14 November 2005 to 20 February 2006. On 20 February, they received one s.c. melatonin implant (LD-M group) and were exposed to natural photoperiodic changes in an open shed. The other females during the experiment were placed in an open shed under natural photoperiod and remained as the control group (C group). The C and LD-M groups...
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This study examines the effect of body condition score (BCS), independently of bodyweight (BW), on the onset of puberty in Blanca Andaluza female kids born in Autumn (November). Thirty-six female kids were distributed into three groups... more
This study examines the effect of body condition score (BCS), independently of bodyweight (BW), on the onset of puberty in Blanca Andaluza female kids born in Autumn (November). Thirty-six female kids were distributed into three groups according to their BW and BCS: low BW and low BCS (LL, n = 10), low BW and high BCS (LH, n = 10), and high BW and high BCS (HH, n = 16). Feeding was adjusted weekly so that the animals would gain ~50 g per day. Oestrus was checked daily using young vasectomised bucks fitted with a marking harness. The ovulation rate was determined by transrectal ultrasonography 10 days after the identification of oestrus. Plasma samples were obtained weekly for progesterone determination. Changes in BW and BCS were also recorded weekly. The BCS had a clear effect on the date of first ovarian activity and first detected oestrus. The HH kids experienced the earliest onset of puberty (31 August ± 2.4 days) although no significant difference was seen compared with the LH ...
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The objective of the present work was to evaluate the effect of diets containing passion fruit cake on the productive performance of the “green terror” (Andinoacara rivulatus)”. Fish were fed four passion fruit diets (T1: 0%, T2: 3%,... more
The objective of the present work was to evaluate the effect of
diets containing passion fruit cake on the productive performance
of the “green terror” (Andinoacara rivulatus)”. Fish were fed four
passion fruit diets (T1: 0%, T2: 3%, T3: 6%, T4: 9%) for 30 days.
The weight increase (WI), relative weight increase (RWI), growth
rate (GR), incremental growth rate (IGR), feed conversion ratio
(FCR), dry matter digestibility, gross protein digestibility (GPD),
gross energy digestibility (GED), protein efficiency rate (PER),
productive value of protein (PVP), and feed cost were assessed.
There were no differences in the final weight, WI, RWI, GR and
IGR values between T1 and T2; only the diet in T3 and T4 showed
poorer results than the T1 diet. FCR was higher in the control diet
(T1) and in T4 than in T2 and T3. As the percentage of passion
fruit increased, the cost of the diet decreased. GPD and GED did
not exhibit differences in T1, T2 and T3, only DT T4 had lower
digestibility values. PER of control DT T1 had a better coefficient
than T2, T3 and T4. Significant differences were found in PVP
between the control DT, T2 and T4. However, the lowest values
were obtained with this latter DT. The addition of up to 3-6%
passion fruit did not affect the yield, and the cost of the diet was
significantly reduced.
diets containing passion fruit cake on the productive performance
of the “green terror” (Andinoacara rivulatus)”. Fish were fed four
passion fruit diets (T1: 0%, T2: 3%, T3: 6%, T4: 9%) for 30 days.
The weight increase (WI), relative weight increase (RWI), growth
rate (GR), incremental growth rate (IGR), feed conversion ratio
(FCR), dry matter digestibility, gross protein digestibility (GPD),
gross energy digestibility (GED), protein efficiency rate (PER),
productive value of protein (PVP), and feed cost were assessed.
There were no differences in the final weight, WI, RWI, GR and
IGR values between T1 and T2; only the diet in T3 and T4 showed
poorer results than the T1 diet. FCR was higher in the control diet
(T1) and in T4 than in T2 and T3. As the percentage of passion
fruit increased, the cost of the diet decreased. GPD and GED did
not exhibit differences in T1, T2 and T3, only DT T4 had lower
digestibility values. PER of control DT T1 had a better coefficient
than T2, T3 and T4. Significant differences were found in PVP
between the control DT, T2 and T4. However, the lowest values
were obtained with this latter DT. The addition of up to 3-6%
passion fruit did not affect the yield, and the cost of the diet was
significantly reduced.
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We analysed how replacing cereal concentrates with dehydrated orange pulp (DOP) in the diet of mother goats affects the meat quality of suckling kids. Three experimental diets for mother goats were designed. The DOP-0 diet contained... more
We analysed how replacing cereal concentrates with dehydrated orange pulp (DOP) in the diet of mother goats affects the meat quality of suckling kids. Three experimental diets for mother goats were designed. The DOP-0 diet contained commercial concentrates and alfalfa hay. In the DOP-40 and DOP-80 diets, 40% and 80% (respectively) of the cereal in the concentrate was replaced with pellets of DOP (the alfalfa hay component was unchanged). We evaluated the chemical composition, texture, water holding capacity, colour, fatty acids (FAs) profile, volatile compounds, and sensorial appraisal of the meat from 30 male suckling kids (cold carcass weight 4.74 kg, 4.82 kg, and 4.65 kg for DOP-0, DOP-40, and DOP-80, respectively) of the Payoya breed (n = 10 for each diet). Meat from kids in the DOP-40 and DOP-80 groups exhibited characteristics favourable for human health, including the meat’s thrombogenicity index, PUFA/SFA ratio (0.60 index), and n-6 PUFA/n-3 PUFA ratio (approximately 7.50). ...
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Resumen es: El fotoperiodo es el principal factor medioambiental que controla la actividad reproductiva en caprino y es interpretado por el animal por la variacion e...
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In Spain, there is growing interest in the conservation of native goat breeds in grazing production systems, and the possibility of conventional farms transitioning to organic. This requires a complete understanding of the repercussions... more
In Spain, there is growing interest in the conservation of native goat breeds in grazing production systems, and the possibility of conventional farms transitioning to organic. This requires a complete understanding of the repercussions of this transition, including its effect on end product sensory quality. An evaluation was done of the sensory attributes of suckling goat meat from two indigenous Spanish breeds (Payoya and Blanca Andaluza) raised in conventional and organic grazing production systems. Of the 21 suckling kids used, 12 were raised in an organic system (6 Payoya and 6 Blanca Andaluza) and 9 in a conventional system (3 Payoya and 6 Blanca Andaluza). Meat sensory profile was evaluated by an analytical panel. The meat from kids raised in organic systems had less intensity of smell and a softer, more tender and juicier texture than meat from the conventional systems. Meat from Blanca Andaluza kids exhibited lower odor intensity and a softer, more tender and juicier textur...
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Article available on line / Article disponible en ligne à l’adresse :... more
Article available on line / Article disponible en ligne à l’adresse : -------------------------------------------------------------------------------------------------------------------------------------------------------------------------http://om.ciheam.org/article.php?IDPDF=4600081 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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En el trabajo se han elegido 24 cabritos pertenecientes a la raza Payoya, 12 machos y 12 hembras con el objeto de comparar los parametros de la calidad de la canal y de la carne. Los resultados nos muestran que aunque existen algunas... more
En el trabajo se han elegido 24 cabritos pertenecientes a la raza Payoya, 12 machos y 12 hembras con el objeto de comparar los parametros de la calidad de la canal y de la carne. Los resultados nos muestran que aunque existen algunas diferencias en algunas medidas de calidad de la carne (pH, CRA, L*, a*, b*, C y Ho), el resto de los parametros estudiados no presentaron diferencias significativas entre los dos sexos.
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In Spain, there is growing interest in the conservation of native goat breeds in grazing production systems, and the possibility of conventional farms transitioning to organic. This requires a complete understanding of the repercussions... more
In Spain, there is growing interest in the conservation of native goat breeds in grazing production systems, and the possibility of conventional farms transitioning to organic. This requires a complete understanding of the repercussions of this transition, including its effect on end product sensory quality. An evaluation was done of the sensory attributes of suckling goat meat from two indigenous Spanish breeds (Payoya and Blanca Andaluza) raised in conventional and organic grazing production systems. Of Rev Mex Cienc Pecu 2021;12(1):306-317 307 the 21 suckling kids used, 12 were raised in an organic system (6 Payoya and 6 Blanca Andaluza) and 9 in a conventional system (3 Payoya and 6 Blanca Andaluza). Meat sensory profile was evaluated by an analytical panel. The meat from kids raised in organic systems had less intensity of smell and a softer, more tender and juicier texture than meat from the conventional systems. Meat from Blanca Andaluza kids exhibited lower odor intensity an...
Como paso previo a la utilización de la torta de maracuyá (TM) en dietas prácticas en la alimentación de animales como fuente proteica en peces con el fin de abaratar su costo, se investigó el efecto de la zona de procedencia y la época... more
Como paso previo a la utilización de la torta de maracuyá (TM) en dietas prácticas en la alimentación de animales como fuente proteica en peces con el fin de abaratar su costo, se investigó el efecto de la zona de procedencia y la época de muestreo sobre su composición bromatológica. Para ello, se han utilizado dos muestras semanales al azar de 1.000 gramos, en agosto y septiembre, con dos repeticiones en cada una de las fábricas extractoras (Vinces y Guayas). El contenido de Materia Seca (92,99±0,17%) y fósforo (P) (0,33±0,01%) fueron superiores en Vinces y la Proteína Bruta (PB) (23,38±0,29%) y la Fibra Bruta (FB) (45,50±1,21%) inferiores. El contenido de PB (24,61±0,27%) y FB (51,20±0,27%) fueron superiores en la TM en septiembre y la Fibra Neutro Detergente (71,80±0,34%) y el P (0,31±0,01%) inferiores. Para el contenido en Extracto Etéreo (12,02±0,29%), cenizas (2,17±0,01%) y calcio (3,11±0,07%) se encontró un valor superior para las muestras de agosto y en Vinces. Se concluye q...