Results of assessment of some reproductive indicators when using Wagyu bovine semen on hybrid HF cattle in Ba Vi and the growth capacity of the herd is born
The aim of this study to evaluate a number of reproductive indicators when using Wagyu bovine semen in the HF cattle breeding herd in Ba Vi bred in the area of Ba Vi Cattle and Forage Research Center. The experiment monitored 245 healthy HF bovine cows without infectious diseases and reproductive diseases, with normal reproductive ability, without defects in appearance as well as in reproductive organs; The bovine cows were bred or bred, aged from 3-6 years, weight ≥ 300 kg for bovine cows and ≥ 400 kg for breeding cows. Select 50 male and 50 female calves from the HF cross cow herd. During the experiment period, some reproductive results were monitored, the growth of calves born from the HF hybrid cow herd and common diseases and the rejection rate of the experimental cattle herd. As a result, the fetal time of HF cows hybridized when artificially fertilized with Wagyu bulls has an average time of 283,29 days; the percentage of female calves born is 53,55%; the percentage of male calves born is 46,45%; the time from calving to estrus is 95,54 days; the time from calving to pregnancy is 131,13 days. The birth weights of selected male and female calves born from hybrid HF herds were 34,4 kg and 32,6 kg, respectively. The mass at 3 months of age of male calves is 104 kg and that of female calves is 99,98 kg with a weight gain during this period of 773,22 and 748,66 grams/head/day/. Calves born with diarrhea 11,4% and Pneumonia 5,46% are the most common. The male calves are eliminated is 3,82% and female calves is 2,18% with the total number of difficult births is 7,10%.
