Labor saving breeding management by ovsynch-timed artificial insemination in Japanese Black beef cows in pasturage
2008
Yamaguchi, M.(National Inst. of Livestock and Grassland Science, Miyota, Nagano (Japan)) | Kido, K. | Hayashi, Y.
The objective of this study was to examine work efficiency for breeding management using synchronized ovulation followed by timed-artificial insemination (Ovsynch-TAI) in pasturage. A total of 55 Japanese Black beef cows were divided into three groups: (1) synchronized ovulation followed by timed-artificial insemination group (Ovsynch; n=18), (2) synchronized estrus followed by AI in proper time (normal AI) group (Es-Syn; n=18), (3) natural estrus followed by normal AI group (control; n=19). As work conditions, the necessary number of people to accommodate a cow or herd in the workshop was three. One person observed the estrus behavior twice a day, at morning and evening; in addition, when estrus behavior was observed in the morning, observations were increased to three times a day (including noon) for judgment of the proper time of AI. The required number of people per cow for AI, the Ovsynch group, the Es-Syn group, and the control group were 1.4, 5.1, and 7.5, respectively; the Ovsynch group required significantly fewer human workers than the Es-Syn group and the control group (P0.05). As the conception rates were 38.9%, 72.2%, and 47.4% for the respective methods, the necessary number of people per conception was 3.5, 7.3, and 17.2, respectively. The Ovsynch group required significantly fewer human workers than the control group (P0.05). The results described above suggest that, in breeding management in pasturage, Ovsynch-TAI can decrease manpower requirements by about 77% compared with the control group.
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