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76%), reduced the percentage in Limousin-sired (70 vs. 61%), but increased the percentage in the Piedmontese-sired group (76 vs. 98%) (Table 3). Numerous studies have indicated Piedmontese is a double-muscled, risograph low-fat breed. Does this interaction suggest the dietary fat “requirement” for breeds risograph of lower body fat content may be different than those for breeds with greater body fat content? If this is true, it has interesting implications as we consider present selection pressure in the industry being for animals with decreased body fat. We think the 162 day fat-feeding period may have been too long for the Hereford risograph and Limousin breeds. The results may have been more favorable if the feeding period would have been shorter. Many studies have been conducted or are underway to determine possible mechanisms acting in the effect of fat on reproductive activity. Animal scientists in Florida have suggested that some of the fatty acids in the diet may inhibit synthesis of prostaglandin by the uterus resulting in extended life of the corpus luteum and its production of progesterone, thus avoiding death of the early embryo.
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