Preliminary results of utility for Wagyu and Red Angus bull's straw frozen semen on Zebu crossbred cows in Thai Binh province, Vietnam
The objectives of this research were to investigate the conception rate, proportion of calving, calving status, gestation length in Zebu crossbred cows artificially inseminated with Wagyu and Red Angus bull’s straw frozen semen, in Thai-Binh Province, from June 2019 – March 2021. Total of 236 Zebu crossbred cows were chosen, inseminated,and monitored for conception, pregnant status, calving, and gestation length. The conventional researching methods, data collection in accordance with rural conditions were applied. Minitab software version 16 and SAS(9.4) were utilized for data analyses. Proc Descriptive Statistics was utilized for analyzing the continuous data. The categorical and nominal data were analyzed by Proc Table. Logistics regression with binary was used to evaluate factors affecting the results of artificial inseminations. The results showedthat the common conception rate of cows inseminated with Red Angus and Wagyu semen was 51.00%, in which 48.00% and 54.00% for cows inseminated with Red Angus and Wagyu semen, respectively. Successful calving proportion of cows acquired 78.91%, in which 75.76% when they were inseminated with Red Angus semen and 81.48% with Wagyu bull’s semen. Parity and cows’ breeds were associated with calving difficulty of Zebu crossbred cows when they were inseminated with Red Angus and Wagyu bull’s semen (P<0.05).It is concluded that Zebu crossbred cows in this region were eligible to be inseminated with Wagyu and Red Angus bulls’ semen to create the highly yielded beef calves in accordance with rural management conditions, adapted with tropical and coastal climate as in Thai-Binh province of Vietnam.
