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The effects of heat stress (HS) on embryo viability decreases as pregnancy progresses [5 - 7], probably because.Embryos become more resistant to the deleterious effects of HS as they develop []. Furthermore 7,There are genetic differences in the resistance of cattle to HS. In that regard breeds which, are more heat tolerant (Bos.Indicus []) zebu have lower body temperatures during HS [8 - 12] and its impact on both milk and meat production.Is lower for them [] when 13 compared with nonadapted breeds (Bos taurine Taurus []). Thus in response,,To HS zebu cattle, suffer less severe reductions in feed intake [8 14 -, 16], growth rate [,], 9 17 milk and.Meat production [18], and reproductive function [,] when 19 20 compared with taurine cattle.
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