NR 17. Feed supplementation with diets based on local resources in postcalving dual purpose cows on Guarico state highlands. Venezuela. I. Effect on the milk production

• Adrian Gonzalez ^[1] ; Carlos Dominguez ^[1] ; Jose A. Ureña ^[1] ; Karel Zahalka ^[1]
  1. [1] UNERG, San Juan de los Morros, Venezuela
• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 5, Nº. 3, 1997 (Ejemplar dedicado a: Proceedings XV ALPA meeting 1)
• Idioma: inglés
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• Resumen

  • Three rations were compared as to their effects on 125 postcalving dual purpose mature cows, weighting 371 +/- 37 kg , grazing native pasture and crop residues, on highland farms at Guárico State. Milk production, body condition (BC) and live weight (LW) was evaluated using a randomized design: T1 = (control), grazing crop residues + Sugar cane bagasse-molasses and mineral mixture; T2 = T1 + tomatoe waste (25 %) + urea mixes of sorghum residues and Pithecelobium saman hulls, urea and minerals mixture; T3 = T1 + tomato waste ad libitum. BC and body weight were estimated at the beginning of the trial and monthly. The milk production was measured weekly. A General Lineal Model was used to analyze: average milk production /month/cow/treatment, and milk production/cow-teat/treatment. The supplements represented 4.9; 13.69 and 19.94 (MJ/d) of Metabolized Energy (EM) for T1, T2 and T3 respectively. The average milk production/cow/week were: 10.92; 11.4;

    13.75 kg and the average milk production /teat/cow/week were: 3.51a; 3.26a; 5.57b kg for T1, T2 and T3 respectively. It is concluded that the tomatoes as a local resource could be a strategic in the improvement of the milk production per cow-teat (P