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Kansas Agricultural Experiment Station Research Reports
1994; Kansas Agricultural Experiment Station contribution; no. 94-373-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 704; Beef; Beef heifers; Energy levels; Ovarian function; Fertility
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Full-Text Articles in Life Sciences
Influence Of Dietary Energy Levels On Reproductive Function And Fertility In Yearling Beef Heifers, S.D. Utter, L.R. Corah
Influence Of Dietary Energy Levels On Reproductive Function And Fertility In Yearling Beef Heifers, S.D. Utter, L.R. Corah
Kansas Agricultural Experiment Station Research Reports
Fifty-nine heifers were allotted to be fed at two different energy levels. One group gained 1.77 lb/hd/day, and the other 1.25 lb/hd/day. Estrus was synchronized with the MGA/prostaglandin system. After MGA removal, ovarian development was monitored daily by ultrasound (10 per group) until estrous was detected following the PGF injection. Heifers were inseminated artificially based on estrus behavior. Faster gaining heifers had higher final body condition scores and greater changes in body condition score. The high energy diet caused a slight (P=.11) decrease in AI pregnancy rate for purebred heifers.