Using Simmental bulls on Hereford cows

摘要

Fourteen registered Hereford cows in the Kansas StateUniversity purebred teaching herd were mated artificially tothe Simmental bull Capitaine #1236 in November and December,1968. The 23 ampules of semen available were used on thefirst 23 Hereford cows to show estrus following November 20,1968. Of cows inseminated, six calved as two-year olds, twoas three-year olds, one at four years, two at five years, oneat eight, and two at ten years of age. The two that calvedat five years of age were sold prior to calving. Both calvedunassisted but one calf was dead at birth. Only three of theremaining 12 cows calved unassisted. Some of those assistedmight have calved unassisted. Early results indicated assistancewas good management, as soon as it appeared to be needed.