Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols
The objective of this study was to evaluate the incidence of repeat breeder (RB) in crossbred dairy cows submitted to a timed artificial insemination (TAI) and estrous synchronization protocols. Data from 371 heifers and 997 lactating crossbred dairy cows were analyzed. Cows with more than 30 DPP w...
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doaj-fda425e9def349ec949065e46a6891b82020-11-25T03:56:21ZengUniversidade de São PauloBrazilian Journal of Veterinary Research and Animal Science1413-95961678-44562017-01-0153410.11606/issn.1678-4456.bjvras.2016.88776109302Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocolsFransergio Souza0João Cesar1Luisa Cunha Carneiro2Ricarda Maria dos Santos3Universidade Federal de Uberlândia, Faculdade de Medicina Veterinária, Departamento de Produção AnimalUniversidade Federal de Uberlândia, Faculdade de Medicina Veterinária, Departamento de Produção AnimalUniversidade Estadual Paulista “Júlio de Mesquita Filho”, Departamento de Medicina Veterinária Preventiva e Reprodução AnimalUniversidade Federal de Uberlândia, Faculdade de Medicina Veterinária, Departamento de Produção Animal The objective of this study was to evaluate the incidence of repeat breeder (RB) in crossbred dairy cows submitted to a timed artificial insemination (TAI) and estrous synchronization protocols. Data from 371 heifers and 997 lactating crossbred dairy cows were analyzed. Cows with more than 30 DPP with good uterine condition, no lameness or clinical mastitis, and body condition score ≥ 2.5 were used. The cows were divided between two groups, as: group 1: TAI – those cows with no CL at ultrasound exam that were enrolled in a TAI protocol and group 2: estrous synchronization – all those cows that had CL. The incidences of RB and factors relative to it were analyzed by logistic regression in SAS. The incidence of RB condition was higher in lactating cows than non-lactating heifers (P < 0.001). There was a tendency of RB condition to higher in cows that calved during spring/summer than those calved at autumn/winter season. The parturition condition had no effect on RB incidence (P > 0.001); however, lactation degree influenced the incidence of RB (P <0.001). Repeat breeder condition was greater in lactating crossbred dairy cows than in heifers. Moreover, the presence of RB cows was higher in those from second parity group when compared to those from first, third and four parity groups; on the other hand, parturition condition did not influence the appearance of RB cows in the herd. http://www.revistas.usp.br/bjvras/article/view/88776FertilityParityReproductionSeason |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fransergio Souza João Cesar Luisa Cunha Carneiro Ricarda Maria dos Santos |
spellingShingle |
Fransergio Souza João Cesar Luisa Cunha Carneiro Ricarda Maria dos Santos Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols Brazilian Journal of Veterinary Research and Animal Science Fertility Parity Reproduction Season |
author_facet |
Fransergio Souza João Cesar Luisa Cunha Carneiro Ricarda Maria dos Santos |
author_sort |
Fransergio Souza |
title |
Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols |
title_short |
Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols |
title_full |
Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols |
title_fullStr |
Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols |
title_full_unstemmed |
Factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols |
title_sort |
factors that enhance repeat breeder condition in a crossbred dairy herd submitted to reproductive synchronization protocols |
publisher |
Universidade de São Paulo |
series |
Brazilian Journal of Veterinary Research and Animal Science |
issn |
1413-9596 1678-4456 |
publishDate |
2017-01-01 |
description |
The objective of this study was to evaluate the incidence of repeat breeder (RB) in crossbred dairy cows submitted to a timed artificial insemination (TAI) and estrous synchronization protocols. Data from 371 heifers and 997 lactating crossbred dairy cows were analyzed. Cows with more than 30 DPP with good uterine condition, no lameness or clinical mastitis, and body condition score ≥ 2.5 were used. The cows were divided between two groups, as: group 1: TAI – those cows with no CL at ultrasound exam that were enrolled in a TAI protocol and group 2: estrous synchronization – all those cows that had CL. The incidences of RB and factors relative to it were analyzed by logistic regression in SAS. The incidence of RB condition was higher in lactating cows than non-lactating heifers (P < 0.001). There was a tendency of RB condition to higher in cows that calved during spring/summer than those calved at autumn/winter season. The parturition condition had no effect on RB incidence (P > 0.001); however, lactation degree influenced the incidence of RB (P <0.001). Repeat breeder condition was greater in lactating crossbred dairy cows than in heifers. Moreover, the presence of RB cows was higher in those from second parity group when compared to those from first, third and four parity groups; on the other hand, parturition condition did not influence the appearance of RB cows in the herd.
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topic |
Fertility Parity Reproduction Season |
url |
http://www.revistas.usp.br/bjvras/article/view/88776 |
work_keys_str_mv |
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