Influences of sire conception rate on pregnancy establishment in dairy cattle.

摘要: Establishment of pregnancy in cattle is complex and encompasses ovulation, fertilization, blastocyst formation growth into an elongated conceptus, recognition signaling, development the embryo placenta. The objective here was to investigate sire influences on establishment cattle. First, 10 Holstein bulls were classified as high or low fertility based their conception rate (SCR) value. In a field trial, at first timed insemination not different between SCR bulls. Next, 5 sires phenotyped using vitro vivo production. There no effect classification cleavage rate, but produced fewer day 8 blastocysts. superovulated heifers, lower percentage unfertilized oocytes degenerated embryos compared Recipient heifers received three five from either 7 postestrus. Day 16 conceptus recovery length groups, transcriptome appreciably sires. reduced ability establish multifactorial sperm fertilizing ability, preimplantation embryonic development, placenta after elongation recognition. These studies highlight importance understanding genetic contributions that crucial increase reproductive efficiency dairy