title: Economic effects of using sexed semen in Japanese dairy herds.
abstract: Dairy farm agricultural income should increase when sexed semen is used instead of unsexed semen. This study simulated three scenarios: using unsexed semen (N), using X sperm of Holstein and unsexed semen of Japanese Black (H), and using X sperm of Holstein and Y sperm of Japanese Black (HJ). Two management scenarios were considered: conventional management (CONV); and the use of Japanese Black semen with surplus cows to produce F(1) s where sufficient replacement female Holstein calves were obtained for maintenance (MAINT). In CONV, the agricultural incomes of H and HJ were 610,000-2,400,000 yen higher than that of N. The agricultural income increased when the difference in the prices between Holstein males and average F(1) male/female calves was 34,000-50,000 yen, that between Holstein male and female calves was 80,000-110,000 yen, and that between F(1) male and female calves was 50,000-90,000 yen. Therefore, the agricultural income can be increased by using sexed semen to select calves of a more valued breed and sex.
authors: National Institute of Livestock and Grassland Science, Tsukuba, Japan. sasa1@affrc.go.jp
authors: Osamu
authors: O
authors: Sasaki
authors: Hirohisa
authors: H
authors: Kimura
authors: Kazuo
authors: K
authors: Ishii
authors: Masahiro
authors: M
authors: Satoh
authors: Yoshitaka
authors: Y
authors: Nagamine
authors: Kunio
authors: K
authors: Yokouchi