2015
DOI: 10.4025/actascianimsci.v37i1.24391
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Abstract: We analyzed the pregnancy rate (PR) and birth rate (BR) of Nellore cows raised extensively in the Cerrado/Pantanal during 4 mating seasons (2009)(2010)(2011)(2012), assessing the relationship with the temperature and humidity index (THI) and the effect of the year and breeding season. We used information from 2,116 cows, which were categorized as either multiparous (n = 1430), primiparous (n = 338), or nulliparous (n = 348). In the months of the breeding season (December-February), temperature and relative hum… Show more

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Cited by 4 publications
(3 citation statements)
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References 29 publications
(25 reference statements)
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“…Embryonic death rate was in the range of 1.5 to 2.8%; whereas, pregnancy rate at the end of the reproductive season was in the range of 87.7 to 90.5%. Although, we observed fetal losses of 5.6 to 7.4% in the experimental herd, the birth rates remained between 81.9 and 83.1%, which are considered as satisfactory reproductive indices for the production system as compared to those of previous reports (OLIVEIRA et al, 2015;NOGUEIRA et al, 2016). Moreover, there were no differences (P>0.05) in the pregnancy, embryonic mortality, and fetal mortality rates among groups undergoing different vaccine protocols (Table 2).…”
Section: --------------------------------------------------------Prevsupporting
confidence: 52%
“…Embryonic death rate was in the range of 1.5 to 2.8%; whereas, pregnancy rate at the end of the reproductive season was in the range of 87.7 to 90.5%. Although, we observed fetal losses of 5.6 to 7.4% in the experimental herd, the birth rates remained between 81.9 and 83.1%, which are considered as satisfactory reproductive indices for the production system as compared to those of previous reports (OLIVEIRA et al, 2015;NOGUEIRA et al, 2016). Moreover, there were no differences (P>0.05) in the pregnancy, embryonic mortality, and fetal mortality rates among groups undergoing different vaccine protocols (Table 2).…”
Section: --------------------------------------------------------Prevsupporting
confidence: 52%
“…In Brazil, natural mating is the most used reproduction system, corresponding to 84% of calves born (Associação Brasileira de Inseminação Artificial, 2019). Normally, breeders adopt a bull:cow ratio of 1:25, which is also used in research activities (Oliveira et al, 2015;Santos et al, 2009). According to Fonseca et al (2000), this results in the underuse of bulls, which makes natural mating antieconomic, underestimating reproductive ability of competent bulls (Chenowet, 2000).…”
Section: Introductionmentioning
confidence: 99%
“…A performance das características de crescimento e reprodutivas na bovinocultura de corte sofrem influências ambientais Oliveira et al, 2015), podendo ser determinante na lucratividade da produção (Laureano et al, 2011).…”
Section: Introductionunclassified