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Reproduction in Domestic Ruminants VII

Reproduction in Domestic Ruminants VII

Managing Fertility in Domestic Ruminants

bp0007rdr28 | Managing Fertility in Domestic Ruminants | REDR2010

Applying nutrition and physiology to improve reproduction in dairy cattle

Santos JEP , Bisinotto RS , Ribeiro ES , Lima FS , Greco LF , Staples CR , Thatcher WW

The establishment and maintenance of pregnancy in lactating dairy cows is a complex biological event that is influenced by a multitude of factors, from the reproductive biology of the cow to managerial aspects of the dairy farm. It is often mentioned in the scientific literature that fertility in dairy cows has declined concurrent with major advances in milk production. Some of this decline is attributed to the negative genetic correlation between milk production and reproduct...

bp0007rdr29 | Managing Fertility in Domestic Ruminants | REDR2010

Controlling the dominant follicle in beef cattle to improve estrous synchronization and early embryonic development

Day ML , Mussard ML , Bridges GA

Estrous synchronization and timed ovulation programs that permit AI at a predetermined time (timed AI) rather than as determined by detection of spontaneous estrus are requisite for increased adoption of AI in the beef cattle industry. In the past two decades, significant progress has been achieved in developing programs that synchronize ovulation to address this need. While this progress has been driven by a multitude of fundamental discoveries in reproductive biology, the gr...

bp0007rdr30 | Managing Fertility in Domestic Ruminants | REDR2010

Causes and consequences of the variation in the number of ovarian follicles in cattle

Evans ACO , Mossa F , Fair T , Lonergan P , Butler ST , Zielak-Steciwko AE , Smith GW , Jimenez-Krassel F , Folger JK , Ireland JLH , Ireland JJ

Summary. In cattle we have noted that the antral follicle count (AFC, follicles ≥3 mm in diameter) varies greatly among animals (from 5 to 50), is repeatable within animals, and is highly correlated with the total number of healthy follicles in ovaries. Also, animals with low AFC have higher serum concentrations of FSH and LH, but lower concentrations of Anti-Mullerian Hormone, progesterone and androgens than animals with high AFC. We have investigated t...