Analysis of the efficiency of active immunization against IBR, BVD and leptospirosis in increasing pregnancy rate in FTAI protocols / Análise da eficiência da imunização ativa contra IBR, BVD e Leptospirose para elevar a taxa de prenhezem protocolos de IATF

Beef cattle farming is a highly representative activity for the GDP of Brazil, rendering the country an important producer of beef. For Brazil to maintain this prominent position, sanitary management actions must be carried out, such as the control of reproductive diseases. This study examines the effectiveness of vaccination against reproductive diseases in bovine females. Data from 8752 Zebu cows on the status of vaccination against reproductive diseases, body condition score (BCS) and the subsequent result of pregnancy diagnosis were evaluated. With regard to BCS, primiparous was the category that most demonstrated the effect of body condition on pregnancy rate, with BCS 3.5 cows having a 30% higher rate than the animals with BCS 2. In the group of nulliparous cows, those with BCS 3.5 had a pregnancy rate of 58% vs. 46% in BCS 3 cows. The induced nulliparae with BCS 3.5 had a 9% higher pregnancy rate than those with BCS 3. Multiparous cows also had a 9% higher rate when their BCS was 3.5 as compared with BCS 2. Among the evaluated dams, 46.5% were vaccinated against IBR, BVD and leptospirosis. Of these, the primiparae showed a 21% increase in conception as compared with the non-vaccinated group; multiparae, 10%; nulliparae, 5.9%; and induced nulliparae, 7.8%. In conclusion, BCS directly influences the reproductive efficiency of bovine females, and the use of vaccination

A bovinocultura de corte é muito representativa para o PIB brasileiro, tornando o país um importante produtor de carne bovina. Para manter este patamar ações de manejo sanitário devem ser executadas, dentre elas o controle de doenças reprodutivas. O presente trabalho teve por objetivo avaliar a eficácia do uso de vacinas contra doenças reprodutivas em fêmeas bovinas. Para isso foram avaliados dados de 8752 fêmeas bovinas zebuínas. Os dados analisados foram referentes à condição vacinal contra doenças reprodutivas, escore de condição corporal (ECC) e posterior resultado do diagnóstico de gestação. Com relação ao ECC, primípara foi a categoria que mais demonstrou o efeito do ECC na taxa de prenhez, com ECC 3,5 apresentou índice 30% superior a animais com ECC 2. Nulíparas apresentaram 58% com ECC 3,5 em comparação ao ECC 3, 46%, assim como as nulíparas induzidas, que com ECC 3,5 apresentaram taxa de prenhez 9% superior as com ECC 3. As multíparas também apresentaram 9% a mais de prenhez quando possuíam ECC 3,5 em comparação ao ECC 2. Dentre as matrizes avaliadas, 46,5% foram vacinadas contra IBR, BVD e leptospirose. Destas, as primíparas, apresentaram 21% de aumento na concepção nas vacinadas, assim como as multíparas que apresentaram 10%, nulíparas 5,9% e nulíparas induzidas 7,8%. Assim concluiu-se que o ECC influencia diretamente na eficiência reprodutiva das fêmeas bovinas e que o uso de vacina contra doenças reprodutivas pode ser indicado, porém esta indicação deve ser baseada em dados epidemiológicos e zootécnicos de cada propriedade.(AU)

Analysis of the efficiency of active immunization against IBR, BVD and leptospirosis in increasing pregnancy rate in FTAI protocols / Análise da eficiência da imunização ativa contra IBR, BVD e Leptospirose para elevar a taxa de prenhezem protocolos de IATF

Beef cattle farming is a highly representative activity for the GDP of Brazil, rendering the country an important producer of beef. For Brazil to maintain this prominent position, sanitary management actions must be carried out, such as the control of reproductive diseases. This study examines the effectiveness of vaccination against reproductive diseases in bovine females. Data from 8752 Zebu cows on the status of vaccination against reproductive diseases, body condition score (BCS) and the subsequent result of pregnancy diagnosis were evaluated. With regard to BCS, primiparous was the category that most demonstrated the effect of body condition on pregnancy rate, with BCS 3.5 cows having a 30% higher rate than the animals with BCS 2. In the group of nulliparous cows, those with BCS 3.5 had a pregnancy rate of 58% vs. 46% in BCS 3 cows. The induced nulliparae with BCS 3.5 had a 9% higher pregnancy rate than those with BCS 3. Multiparous cows also had a 9% higher rate when their BCS was 3.5 as compared with BCS 2. Among the evaluated dams, 46.5% were vaccinated against IBR, BVD and leptospirosis. Of these, the primiparae showed a 21% increase in conception as compared with the non-vaccinated group; multiparae, 10%; nulliparae, 5.9%; and induced nulliparae, 7.8%. In conclusion, BCS directly influences the reproductive efficiency of bovine females, and the use of vaccination

A bovinocultura de corte é muito representativa para o PIB brasileiro, tornando o país um importante produtor de carne bovina. Para manter este patamar ações de manejo sanitário devem ser executadas, dentre elas o controle de doenças reprodutivas. O presente trabalho teve por objetivo avaliar a eficácia do uso de vacinas contra doenças reprodutivas em fêmeas bovinas. Para isso foram avaliados dados de 8752 fêmeas bovinas zebuínas. Os dados analisados foram referentes à condição vacinal contra doenças reprodutivas, escore de condição corporal (ECC) e posterior resultado do diagnóstico de gestação. Com relação ao ECC, primípara foi a categoria que mais demonstrou o efeito do ECC na taxa de prenhez, com ECC 3,5 apresentou índice 30% superior a animais com ECC 2. Nulíparas apresentaram 58% com ECC 3,5 em comparação ao ECC 3, 46%, assim como as nulíparas induzidas, que com ECC 3,5 apresentaram taxa de prenhez 9% superior as com ECC 3. As multíparas também apresentaram 9% a mais de prenhez quando possuíam ECC 3,5 em comparação ao ECC 2. Dentre as matrizes avaliadas, 46,5% foram vacinadas contra IBR, BVD e leptospirose. Destas, as primíparas, apresentaram 21% de aumento na concepção nas vacinadas, assim como as multíparas que apresentaram 10%, nulíparas 5,9% e nulíparas induzidas 7,8%. Assim concluiu-se que o ECC influencia diretamente na eficiência reprodutiva das fêmeas bovinas e que o uso de vacina contra doenças reprodutivas pode ser indicado, porém esta indicação deve ser baseada em dados epidemiológicos e zootécnicos de cada propriedade.

Male effect and breeding season shortening under contrasting climatic conditions upon reproduction of nulliparous Anglo-Nubians / Efeito do macho e redução das estações de monta em diferentes condições climática a reprodução de nulíparas Anglo-Nubiana

This study was aimed to evaluate breeding seasons of different durations under contrasting climatic conditions upon reproductive performance of nulli­parous does submitted to male effect. A total of 240 Anglo-Nubian females at 8 to 12 months of age were used and were kept away from all three bucks at a distance of 300 m for 60 days, which avoided any physical, visual, olfactory or hearing contact between genders. Estrus were visually detected and pregnancy rates were determined by ultrasonography 60 days after the last mating. Breeding season duration and climatic condition did not influence estrus incidence, where 70% does had estrus detected at the dry season, 80% of does cycled at the rainy season within breeding seasons of 25 days. Moreover, 80% of does cycled at the dry season and 95% at the rainy season during breeding seasons of 35 days and 45 days. After breeding seasons of 25 days, pregnancy rate was lower at the dry season (55.0%) compared to the rainy season (80.0%). Mean birth weight of resulting offspring was lower during the rainy season (2.94 kg ± 0.26) than during the dry season (3.03 kg ± 0.16). The results show that estrus onset is affected by breeding season durations and climatic conditions tested, although dry season lowered pregnancy rates. In conclusion, 25-day breeding seasons are recommended to improve standardization of offspring lots, to reduce costs with food supplementation and estrus detection, while preserving pregnancy and kidding rates.

Male effect and breeding season shortening under contrasting climatic conditions upon reproduction of nulliparous Anglo-Nubians / Efeito do macho e redução das estações de monta em diferentes condições climática a reprodução de nulíparas Anglo-Nubiana

This study was aimed to evaluate breeding seasons of different durations under contrasting climatic conditions upon reproductive performance of nulli­parous does submitted to male effect. A total of 240 Anglo-Nubian females at 8 to 12 months of age were used and were kept away from all three bucks at a distance of 300 m for 60 days, which avoided any physical, visual, olfactory or hearing contact between genders. Estrus were visually detected and pregnancy rates were determined by ultrasonography 60 days after the last mating. Breeding season duration and climatic condition did not influence estrus incidence, where 70% does had estrus detected at the dry season, 80% of does cycled at the rainy season within breeding seasons of 25 days. Moreover, 80% of does cycled at the dry season and 95% at the rainy season during breeding seasons of 35 days and 45 days. After breeding seasons of 25 days, pregnancy rate was lower at the dry season (55.0%) compared to the rainy season (80.0%). Mean birth weight of resulting offspring was lower during the rainy season (2.94 kg ± 0.26) than during the dry season (3.03 kg ± 0.16). The results show that estrus onset is affected by breeding season durations and climatic conditions tested, although dry season lowered pregnancy rates. In conclusion, 25-day breeding seasons are recommended to improve standardization of offspring lots, to reduce costs with food supplementation and estrus detection, while preserving pregnancy and kidding rates.(AU)