2007
DOI: 10.1016/j.anireprosci.2006.09.010
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Factors affecting reproductive performance of Holstein heifers

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Cited by 30 publications
(31 citation statements)
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“…In the present study, however, pregnancy losses in both groups were 18.9%, which are in agreement with the results of previous studies (Smith and Stevenson, 1995;Fricke et al, 1998;Rivera et al, 2004) which reported that 5% to 20.5% of pregnancies in lactating dairy heifers were lost between 30 and 75 days of gestation. In addition, the proportion of Holstein heifers which experienced pregnancy loss between 40 and 90 days of gestation was 3.4% (Chebel et al, 2007). As expected, PR to second AI was higher for CGPG than for GPG heifers, while no differences were detected in cumulative PRs to third, and upto the fourth AI between the two groups (Table 4).…”
supporting
confidence: 62%
“…In the present study, however, pregnancy losses in both groups were 18.9%, which are in agreement with the results of previous studies (Smith and Stevenson, 1995;Fricke et al, 1998;Rivera et al, 2004) which reported that 5% to 20.5% of pregnancies in lactating dairy heifers were lost between 30 and 75 days of gestation. In addition, the proportion of Holstein heifers which experienced pregnancy loss between 40 and 90 days of gestation was 3.4% (Chebel et al, 2007). As expected, PR to second AI was higher for CGPG than for GPG heifers, while no differences were detected in cumulative PRs to third, and upto the fourth AI between the two groups (Table 4).…”
supporting
confidence: 62%
“…In general, differences in AFC of temperate breeds kept in the tropics are largely attributed to differences in management practices (Avendaño-Reyes et al 2010). The seasonal variability of AFS could, however, be associated with variability of the quantity and quality of feeds which in turn affects the prepubertal growth and development of calves and as a result, a high proportion of underfed heifers in adverse conditions do not reach puberty at the right time (Chebel et al 2007). Additionally, the wide variations of both AFS and AFC over the years and the overall improving trend indicate influence of various aspects of the environment on the animals and more specifically management practices and the climate (Ansari-Lari et al 2009).…”
Section: Discussionmentioning
confidence: 97%
“…Rudolf (2010) stated that the first estrus will occur when the cattle reaches the minimum weight, rather than reaching a certain age. Puberty in cattle are influenced by genetics (Nogueira, 2004), feed and weaning age (Guggeri et al, 2014), maintenance management and climate (Chebel et al, 2007). These factors will indefinitely affect to body weight and cattle growth levels (Abeygunawardena and Dematewewa 2004).…”
Section: Vaginal Smear Testmentioning
confidence: 99%