Comparison of conception of 50 % and 75 % of HF crossbreds at various ages and heat
1986
Surin Jittrasawasd (Chonburi A.I. Research Center, Chonburi (Thailand))
During 1979-1986, 115 heads of 50 % and 75 % HF crossbred were artificially inseminated. Forty two of them were fist inseminated at 1.5 years of age, 38 at 2 years, 12 at 2.5 years, and 10 at 3 years of age. No return of heat and pregnancy was checked 2 months later, then the nonconceived heifers were reinseminated. The rate of conception after single insemination in 50 % HF crossbred heifers at 1.5 to 2 years of age with 3 or more heats was good. However, double insemination in 75 % heifers at 2 years of age gave better conception rate. Crossbred between HF and Brahman heifers usually showed signs of the first heat around 2 years of age and also gave a good conception rate upon the first heat.
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