Reduced fertility prolongs the interval from calving to conception in dairy cows, resulting in significant economic losses to dairy farms. Up to 25% of cows are culled due to reproductive failure, and ...
As I pointed out in the article referred to by Prof. Thomson Flynn in NATURE of June 30, p. 1020 (Biol. Rev., 2, 129; 1927), parturition is certainly due to several factors, of which the decline of ...
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