Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento
Autor(a) principal: | |
---|---|
Data de Publicação: | 2016 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/4387 |
Resumo: | The objective of this work was to evaluate the reproductive performance of beef heifers in the first and second reproductive year. Two hundred twenty- seven heifers mated for the first time at 24 months old, which reached the minimum live weight of 50% of the adult weight, and were mated from 2003 to 2012 and raised at the Beef Cattle Laboratory (LBC) of the Animal Science Department of Federal University of Santa Maria (UFSM) were studied. In chapter 1, each variable was evaluated through logistic regression, by the LOGISTIC procedure available at SAS. The explanation for the pregnancy rate (58.1%) in the first reproductive year was the intensity of the weight gain from 7 to 18 months old and from 18 to 24 months old. In the second reproductive year, the pregnancy rate of the primiparae (49.5%) was explained by the variation on the weight of the heifers from the age of 24 months old to the birth; by the Julian date of birth; by the average daily gain from the weaning to the end of the breeding season and by the adjusted weight of the calf at weaning (75 days). In chapter 2, the heifers were grouped in three classes of live weight at 24 months old, being them: between 50 and 59.9% of adult weight (55%); from 60 to 69.9% of adult weight (65%) and between 70 and 80% of adult weight (75%). The performance of the heifers was monitored from 7 months old until the end of the second breeding. The pregnancy rate in the first reproductive year was 38.0%; 56.4% and 69.0% for the heifers mated with the weight range of 55% 65% and 75%, respectively. The weight difference between 24 months old and the birth was superior (P<0.05) on the classes of 55% (37.8 kg) and 65% (24.5 kg) compared to the class of 75% (-7.9 kg). The pregnancy repetition rate did not suffer effect of the weight class at the first mating (P>0.05) with values of 41.6%; 42.1% and 50.4%. When the mating weight of the heifers is not a limiting factor, the weight gain intensity between 7 and 24 months old is the main factor that influences on the pregnancy rates. In the second reproductive year, higher weight increments along the period of mating and gestation, as well as the reduction of the birth date and an increase on the weight gain intensity in post weaning are necessary in order to increase the pregnancy repetition indexes. The increase of weight before the mating of the heifers at two years old influences on the reproductive performance at the first breeding; promotes higher weight at birth, weaning and at the end of the second breeding in relation to the heifers mated between 50% and 60% of the adult weight, however it results in a higher assistance in the second reproductive year due to the higher corporal development. |
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2016-10-102016-10-102016-07-01PACHECO, Rangel Fernandes. BEEF PATS FEMALES REPRODUCTIVE PERFORMANCE IN THE FIRST AND SECOUND BREEDING SEASON. 2016. 97 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Santa Maria, Santa Maria, 2016.http://repositorio.ufsm.br/handle/1/4387The objective of this work was to evaluate the reproductive performance of beef heifers in the first and second reproductive year. Two hundred twenty- seven heifers mated for the first time at 24 months old, which reached the minimum live weight of 50% of the adult weight, and were mated from 2003 to 2012 and raised at the Beef Cattle Laboratory (LBC) of the Animal Science Department of Federal University of Santa Maria (UFSM) were studied. In chapter 1, each variable was evaluated through logistic regression, by the LOGISTIC procedure available at SAS. The explanation for the pregnancy rate (58.1%) in the first reproductive year was the intensity of the weight gain from 7 to 18 months old and from 18 to 24 months old. In the second reproductive year, the pregnancy rate of the primiparae (49.5%) was explained by the variation on the weight of the heifers from the age of 24 months old to the birth; by the Julian date of birth; by the average daily gain from the weaning to the end of the breeding season and by the adjusted weight of the calf at weaning (75 days). In chapter 2, the heifers were grouped in three classes of live weight at 24 months old, being them: between 50 and 59.9% of adult weight (55%); from 60 to 69.9% of adult weight (65%) and between 70 and 80% of adult weight (75%). The performance of the heifers was monitored from 7 months old until the end of the second breeding. The pregnancy rate in the first reproductive year was 38.0%; 56.4% and 69.0% for the heifers mated with the weight range of 55% 65% and 75%, respectively. The weight difference between 24 months old and the birth was superior (P<0.05) on the classes of 55% (37.8 kg) and 65% (24.5 kg) compared to the class of 75% (-7.9 kg). The pregnancy repetition rate did not suffer effect of the weight class at the first mating (P>0.05) with values of 41.6%; 42.1% and 50.4%. When the mating weight of the heifers is not a limiting factor, the weight gain intensity between 7 and 24 months old is the main factor that influences on the pregnancy rates. In the second reproductive year, higher weight increments along the period of mating and gestation, as well as the reduction of the birth date and an increase on the weight gain intensity in post weaning are necessary in order to increase the pregnancy repetition indexes. The increase of weight before the mating of the heifers at two years old influences on the reproductive performance at the first breeding; promotes higher weight at birth, weaning and at the end of the second breeding in relation to the heifers mated between 50% and 60% of the adult weight, however it results in a higher assistance in the second reproductive year due to the higher corporal development.Objetivou-se avaliar o desempenho reprodutivo de novilhas de corte no primeiro e segundo ano reprodutivo. Para isso, foram estudadas 227 novilhas acasaladas pela primeira vez aos 24 meses de idade, que atingiram peso vivo mínimo de 50% do peso adulto e acasaladas entre os anos de 2003 a 2012, criadas no Laboratório de Bovinocultura de Corte (LBC) do Departamento de Zootecnia da Universidade Federal de Santa Maria (UFSM). No capítulo 1, cada variável foi avaliada através de regressão logística, pelo procedimento LOGISTIC, disponível no SAS. A explicação para a taxa de prenhez (58,1%) no primeiro ano reprodutivo foi a intensidade de ganho de peso dos 7 aos 18 meses de idade e dos 18 aos 24 meses de idade. No segundo ano reprodutivo, a taxa de prenhez das primíparas (49,5%) foi explicada pela variação de peso das novilhas entre os 24 meses de idade e o parto; pela data juliana de parto; pelo ganho médio diário entre o desmame e o final de monta e pelo peso ajustado do bezerro ao desmame (75 dias). No capítulo 2, as novilhas foram agrupadas em três classes de peso vivo aos 24 meses de idade, sendo eles: entre 50 a 59,9% do peso adulto (55%); de 60 a 69,9% do peso adulto (65%) e entre 70 a 80% do peso adulto (75%). Foi monitorado o desempenho das novilhas dos 7 meses de idade até o final da segunda monta. A taxa de prenhez no primeiro ano reprodutivo foi de 38,0%; 56,4% e 69,0% para às acasaladas com faixa de peso de 55%, 65% e 75%; respectivamente. A diferença de peso entre os 24 meses de idade e o parto foi superior (P<0,05) nas de classe 55% (37,8 kg) e 65% (24,5 kg) frente às de 75% (-7,9 kg). A taxa de repetição de prenhez não sofreu efeito da classe de peso ao primeiro acasalamento (P>0,05) com valores de 41,6%; 42,1% e 50,4%. Quando o peso ao acasalamento de novilhas não é um fator limitante a intensidade de ganho de peso entre os 7 aos 24 meses de idade é o principal fator que influência a taxa de prenhez. No segundo ano reprodutivo, maiores incrementos de peso ao longo do período de acasalamento e gestação, assim como redução na data de parto e aumento na intensidade de ganho de peso no pós desmame são necessários para aumento nos índices de repetição de prenhez. A elevação do peso antes do acasalamento de novilhas aos dois anos de idade interfere no desempenho reprodutivo na primeira monta; promove maior peso ao parto, desmame e final da segunda monta em relação às acasaladas entre 50 a 60% do peso adulto, no entanto resulta em maiores cuidados no segundo ano reprodutivo tendo em vista o maior desenvolvimento corporal.Conselho Nacional de Desenvolvimento Científico e Tecnológicoapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em ZootecniaUFSMBRZootecniaClasse de pesoPós-partoPrimíparasRegressão logísticaRepetição de prenhezTaxa de prenhezLogistic regressionPostpartumPregnancy ratePregnancy repetitionPrimiparaeWeight classCNPQ::CIENCIAS AGRARIAS::ZOOTECNIADesempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamentoBeef pats females reproductive performance in the first and secound breeding seasoninfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisBrondani, Ivan Luizhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780102Z0Alves Filho, Dari Celestinohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4728123E5Souza, Alexandre Nunes Motta dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4764557J9Freitas, Leandro da Silvahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4710023U2Pazdiora, Raul Dirceuhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4551842A0http://lattes.cnpq.br/0371141427769042Pacheco, Rangel Fernandes500400000002400300300300300300300734f41d9-cb39-4ca4-81e7-b1d776cdc0dbaf1047a1-5fa6-44cb-8bd2-2397b66da11ae5834d46-c91a-4bed-a42a-b8fbc60b47ef596bbe69-ab3f-4f87-a225-f1ad0b80fc6ed6303360-4406-40ba-9ef1-b06fd847d86b1bc83f98-057d-4f02-b8fd-4dbcb1c30e64info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALPACHECO, RANGEL FERNANDES.pdfTese de Doutoradoapplication/pdf942815http://repositorio.ufsm.br/bitstream/1/4387/1/PACHECO%2c%20RANGEL%20FERNANDES.pdf4cd57117022509bade4c76debf8a34aaMD51TEXTPACHECO, RANGEL FERNANDES.pdf.txtPACHECO, RANGEL FERNANDES.pdf.txtExtracted texttext/plain248526http://repositorio.ufsm.br/bitstream/1/4387/2/PACHECO%2c%20RANGEL%20FERNANDES.pdf.txta702b7b6f798ddf32c9fea1c7714e028MD52THUMBNAILPACHECO, RANGEL FERNANDES.pdf.jpgPACHECO, RANGEL FERNANDES.pdf.jpgIM Thumbnailimage/jpeg4636http://repositorio.ufsm.br/bitstream/1/4387/3/PACHECO%2c%20RANGEL%20FERNANDES.pdf.jpg966d0dceb56801fb9b1e58de112d4080MD531/43872017-09-05 16:24:52.142oai:repositorio.ufsm.br:1/4387Repositório Institucionalhttp://repositorio.ufsm.br/PUBhttp://repositorio.ufsm.br/oai/requestopendoar:39132017-09-05T19:24:52Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
dc.title.alternative.eng.fl_str_mv |
Beef pats females reproductive performance in the first and secound breeding season |
title |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
spellingShingle |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento Pacheco, Rangel Fernandes Classe de peso Pós-parto Primíparas Regressão logística Repetição de prenhez Taxa de prenhez Logistic regression Postpartum Pregnancy rate Pregnancy repetition Primiparae Weight class CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA |
title_short |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
title_full |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
title_fullStr |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
title_full_unstemmed |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
title_sort |
Desempenho reprodutivo de fêmeas bovinas de corte no primeiro e segundo ano de acasalamento |
author |
Pacheco, Rangel Fernandes |
author_facet |
Pacheco, Rangel Fernandes |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Brondani, Ivan Luiz |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780102Z0 |
dc.contributor.referee1.fl_str_mv |
Alves Filho, Dari Celestino |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4728123E5 |
dc.contributor.referee2.fl_str_mv |
Souza, Alexandre Nunes Motta de |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4764557J9 |
dc.contributor.referee3.fl_str_mv |
Freitas, Leandro da Silva |
dc.contributor.referee3Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4710023U2 |
dc.contributor.referee4.fl_str_mv |
Pazdiora, Raul Dirceu |
dc.contributor.referee4Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4551842A0 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/0371141427769042 |
dc.contributor.author.fl_str_mv |
Pacheco, Rangel Fernandes |
contributor_str_mv |
Brondani, Ivan Luiz Alves Filho, Dari Celestino Souza, Alexandre Nunes Motta de Freitas, Leandro da Silva Pazdiora, Raul Dirceu |
dc.subject.por.fl_str_mv |
Classe de peso Pós-parto Primíparas Regressão logística Repetição de prenhez Taxa de prenhez |
topic |
Classe de peso Pós-parto Primíparas Regressão logística Repetição de prenhez Taxa de prenhez Logistic regression Postpartum Pregnancy rate Pregnancy repetition Primiparae Weight class CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA |
dc.subject.eng.fl_str_mv |
Logistic regression Postpartum Pregnancy rate Pregnancy repetition Primiparae Weight class |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA |
description |
The objective of this work was to evaluate the reproductive performance of beef heifers in the first and second reproductive year. Two hundred twenty- seven heifers mated for the first time at 24 months old, which reached the minimum live weight of 50% of the adult weight, and were mated from 2003 to 2012 and raised at the Beef Cattle Laboratory (LBC) of the Animal Science Department of Federal University of Santa Maria (UFSM) were studied. In chapter 1, each variable was evaluated through logistic regression, by the LOGISTIC procedure available at SAS. The explanation for the pregnancy rate (58.1%) in the first reproductive year was the intensity of the weight gain from 7 to 18 months old and from 18 to 24 months old. In the second reproductive year, the pregnancy rate of the primiparae (49.5%) was explained by the variation on the weight of the heifers from the age of 24 months old to the birth; by the Julian date of birth; by the average daily gain from the weaning to the end of the breeding season and by the adjusted weight of the calf at weaning (75 days). In chapter 2, the heifers were grouped in three classes of live weight at 24 months old, being them: between 50 and 59.9% of adult weight (55%); from 60 to 69.9% of adult weight (65%) and between 70 and 80% of adult weight (75%). The performance of the heifers was monitored from 7 months old until the end of the second breeding. The pregnancy rate in the first reproductive year was 38.0%; 56.4% and 69.0% for the heifers mated with the weight range of 55% 65% and 75%, respectively. The weight difference between 24 months old and the birth was superior (P<0.05) on the classes of 55% (37.8 kg) and 65% (24.5 kg) compared to the class of 75% (-7.9 kg). The pregnancy repetition rate did not suffer effect of the weight class at the first mating (P>0.05) with values of 41.6%; 42.1% and 50.4%. When the mating weight of the heifers is not a limiting factor, the weight gain intensity between 7 and 24 months old is the main factor that influences on the pregnancy rates. In the second reproductive year, higher weight increments along the period of mating and gestation, as well as the reduction of the birth date and an increase on the weight gain intensity in post weaning are necessary in order to increase the pregnancy repetition indexes. The increase of weight before the mating of the heifers at two years old influences on the reproductive performance at the first breeding; promotes higher weight at birth, weaning and at the end of the second breeding in relation to the heifers mated between 50% and 60% of the adult weight, however it results in a higher assistance in the second reproductive year due to the higher corporal development. |
publishDate |
2016 |
dc.date.accessioned.fl_str_mv |
2016-10-10 |
dc.date.available.fl_str_mv |
2016-10-10 |
dc.date.issued.fl_str_mv |
2016-07-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
PACHECO, Rangel Fernandes. BEEF PATS FEMALES REPRODUCTIVE PERFORMANCE IN THE FIRST AND SECOUND BREEDING SEASON. 2016. 97 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Santa Maria, Santa Maria, 2016. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/4387 |
identifier_str_mv |
PACHECO, Rangel Fernandes. BEEF PATS FEMALES REPRODUCTIVE PERFORMANCE IN THE FIRST AND SECOUND BREEDING SEASON. 2016. 97 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Santa Maria, Santa Maria, 2016. |
url |
http://repositorio.ufsm.br/handle/1/4387 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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500400000002 |
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400 300 300 300 300 300 300 |
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openAccess |
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Universidade Federal de Santa Maria |
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Programa de Pós-Graduação em Zootecnia |
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UFSM |
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BR |
dc.publisher.department.fl_str_mv |
Zootecnia |
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Universidade Federal de Santa Maria |
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