Estimación lineal de los requerimientos nutricionales del NRC para ganado de leche
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Linear regression equations have been obtained to directly calculate the nutrient requirements of dairy cattle (TDN, DE, ME, NEL,CP, Ca, P, Vitamin A and Vitamin D) on different physiological stages: maintenance, pregnancy and milk production based on NRC nutrient requirements tables.Abstract:
Linear regression equations have been obtained to directly calculatenutrient requirements of dairy cattle (TDN, DE, ME, NEL,CP, Ca, P, Vitamin A and Vitamin D) on differentphysiological stages: maintenance, pregnancy and milkproduction based on NRC nutrient requirements tables. TheR-square was calculated for each equation to establish thedegree of adjustment.read more
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Effects of heat-stress on production in dairy cattle.
TL;DR: Maintaining cow performance in hot, humid climatic conditions in the future will likely require improved cooling capability, continued advances in nutritional formulation, and the need for genetic advancement which includes selection for heat tolerance or the identification of genetic traits which enhance heat tolerance.
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Nitrogen Metabolism in the Rumen
TL;DR: It was concluded that optimum bacterial growth in the rumen occurs when EMPS is 29 g of bacterial N/kg of fermented organic matter, and ENU is 69%, implying that bacteria would require about 1.31 x rumen-available N per unit ofacterial N.
Journal ArticleDOI
Heat stress in lactating dairy cows: a review
TL;DR: A review of factors influencing heat stress in lactating dairy cows and how it affects milk production is provided in this article, where the thermoneutral zone, heat production and heat gain, heat dissipation mechanisms, and how the lactating cow responds to heat stress are discussed.
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Invited review: Body condition score and its association with dairy cow productivity, health, and welfare
TL;DR: There is relative consistency in the associations among calving and nadir BCS, and BCS change on milk production, postpartum anestrous, the likelihood of a successful pregnancy and days open, therisk of uterine infection, and the risk of metabolic disorders.
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Subacute ruminal acidosis in dairy cows: the physiological causes, incidence and consequences.
TL;DR: Increases in acute phase proteins vary among methods of SARA induction, even when the methods result in similar rumen pH depressions, suggesting that the inflammatory response might not be solely due to bacterial endotoxin in the rumen.
References
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Book
Milk Production from Pasture
TL;DR: Milk production from pasture, Milk production from grazing, مرکز فناوری اطلاعات و اصاع رسانی, کδاوρزی
Journal ArticleDOI
Milk production from pasture.
J. Glover,H. W. Dougall +1 more
TL;DR: In this paper, it was shown that the available energy contained in the dry matter of Kenya pastures at all stages of growth is remarkably constant, i.e. T.n.c.d.