2009年5月1日 · The objective of this research was to document the effects of breed, cow's parity and age, conception herd-year and month, parturition code (multiple birth status and calf sex), …

2019年1月1日 · A study using US data showed strong evidence that choice of service bulls (direct GL) can either increase or decrease the GL of cows to which they are mated, which means …

2011年2月1日 · Genetic evaluations for gestation length (GL) for Holstein service sires were studied to determine their effectiveness in predicting GL in an independent data set. …

Service-sire and cow-sire GL evaluations were moderately correlated regardless of the population (heifer or cow) on which they were based. Several genetic and environmental factors can help …

The objective of this research was to document the effects of breed, cow’s parity and age, conception herdyear and month, parturition code (multiple birth status and calf sex), cow’s …

Gestation length (GL), the period from effective fertilization until calving, is a reproductive trait that significantly affects cattle breeding and production. The cow’s age is the key environmental …

2013年6月1日 · This study aimed to estimate the genetic relationships between CE, GL, and other dairy traits of interest using a national data set of 31,053 primiparous cow performance …

Brown Swiss, Holsteins, and Jerseys, which had the most heifer gestations, had cow GL that was 0.3 to 1.6 d longer than heifer GL. Longer GL for cows than for heifers supports the literature …

Gestation length (GL) can potentially affect health and performance of both the dam and the newborn calf, and it is controlled by two genetic components, direct and...

Genetic evaluations for gestation length (GL) for Holstein service sires were studied to determine their effectiveness in predicting GL in an independent data set. Consequences of selection on …