A function is presented to which nonlinear programming techniques could be applied to quantify the potential of super-ovulation, embryo transfer, sexed semen, in vitro fertilization and in vitro maturation of oocytes used singularly or in combination to improve genetically beef cattle growth and(or) reproductive efficiency. The function to be maximized adds genetic gain times the sale price of ...

It has long been common knowledge that certain twins resemble one another in a remarkable way. The fact that many more like sexed twins are born than the theoretical ratio 1: 2: 1 would demand constitutes evidence in favour of the belief that such twins are monozygotic, for the actual figures of twin births can be adequately explained on the assumption that about one half the pairs of like sexe...

The current cervical artificial insemination (CAI) procedure, involving deposition of excessive sperm numbers, is uneconomical for pig industry. The most obvious alternative requires uterine deposition in combination with fixed-time AI, which would reduce the number of sperm required per pregnant sow, thus allowing the best use of valuable boars and, ultimately, the commercial integration of fr...

Abstract The Virginia Master Cattlemen program has the goal to provide beef producers with essential knowledge in areas of production. Every year, from VA and neighboring states participate this comprehensive 14-hour long program. During 2021 program, we performed an online survey participants addressing their reproductive management practices. We have obtained data 133 participants, which 67.7...

The pasture-based replacement dairy heifer is typically housed and managed intensively from birth until weaning, but post-weaning outdoors in paddocks under less intensive management. Little published about the welfare of weaned systems. aim this review to consolidate scientific literature provide an overview factors affecting heifers on pastoral dairies. Heifer during transition milking herd c...