| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Pantanal. |
|
Data corrente: |
27/07/1995 |
|
Data da última atualização: |
27/07/1995 |
|
Autoria: |
LASTER, D. B.; GLIMP, H. A.; GREGORY, K. E. |
|
Título: |
Effects of early weaning on postpartum reproduction of cows. |
|
Ano de publicação: |
1973 |
|
Fonte/Imprenta: |
Journal of Animal Science, v.36, n.4, p.734-740, 1973. |
|
Idioma: |
Inglês |
|
Conteúdo: |
Three-hundred-eight Hereford, Angus, Charolais-cross (Charolais.Hereford and Charolais-Agus), Red Poll and Brown Swiss ranging in age from 2 to 11 years were used to investigate the effects of weaning 1 week before the beginning of the breeding period on postpartum reproduction. The calving period was 67 days and breeding began 27 days after the end of the calving period and extended for 42 days in November and December. Hereford, Angus and Charolais-cross cows were inseminated artificially approximately 12 hr. after the observation of standing estrus. Weaning increased overall conception in the 42-day breeding period by 25.9% in 2-year-old cows, 15.6% in 3-year-olds and 7.9% in cows 4 years old and older (mature cows). There were 13.8% more 2-year-old cows and 15.6% more mature cows preganant at the end of the first 21 days of breeding in the weaned than in the nonweaned groups, but these differences were not statistically significnt. Weaning increased the percentage of cows exhibiting estrus from calving to the end of the breeding period by 29% in 2-year-olds, 26.7% in 3-year-olds and 16.3% in mature cows. Weaning also increased the percentage of cows exhibiting estrus during the first 21 days of breeding by 39.2% in 2-year-olds and 23.5% in 3-years-olds, but in had no influence or the occurrence of estrus in mature cows. Weaning had no effect on inseminations per conception in the 2- and 3-year-olds, but the mature cows in the weaned group required 0.28 more inseminations per conception than those in the nonweaned group. Among the cows bred, the intervals from calving to first breeding and clving to conception were not decreased by weaning. These intervals were affected by breed of cow and by calving date. The increased percentage of the cows from the weaned group that conceived during the 42-day breeding period was the result of the effects of weaning on the occurrence of estrus, rather than on conception rate among those inseminated. MenosThree-hundred-eight Hereford, Angus, Charolais-cross (Charolais.Hereford and Charolais-Agus), Red Poll and Brown Swiss ranging in age from 2 to 11 years were used to investigate the effects of weaning 1 week before the beginning of the breeding period on postpartum reproduction. The calving period was 67 days and breeding began 27 days after the end of the calving period and extended for 42 days in November and December. Hereford, Angus and Charolais-cross cows were inseminated artificially approximately 12 hr. after the observation of standing estrus. Weaning increased overall conception in the 42-day breeding period by 25.9% in 2-year-old cows, 15.6% in 3-year-olds and 7.9% in cows 4 years old and older (mature cows). There were 13.8% more 2-year-old cows and 15.6% more mature cows preganant at the end of the first 21 days of breeding in the weaned than in the nonweaned groups, but these differences were not statistically significnt. Weaning increased the percentage of cows exhibiting estrus from calving to the end of the breeding period by 29% in 2-year-olds, 26.7% in 3-year-olds and 16.3% in mature cows. Weaning also increased the percentage of cows exhibiting estrus during the first 21 days of breeding by 39.2% in 2-year-olds and 23.5% in 3-years-olds, but in had no influence or the occurrence of estrus in mature cows. Weaning had no effect on inseminations per conception in the 2- and 3-year-olds, but the mature cows in the weaned group required 0.28 more inseminations... Mostrar Tudo |
|
Palavras-Chave: |
Bovine; Period on postpartum; Periodo pos-parto. |
|
Thesagro: |
Bovino; Reprodução. |
|
Thesaurus Nal: |
reproduction. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02545naa a2200217 a 4500
001 1785094
005 1995-07-27
008 1973 bl --- 0-- u #d
100 1 $aLASTER, D. B.
245 $aEffects of early weaning on postpartum reproduction of cows.
260 $c1973
520 $aThree-hundred-eight Hereford, Angus, Charolais-cross (Charolais.Hereford and Charolais-Agus), Red Poll and Brown Swiss ranging in age from 2 to 11 years were used to investigate the effects of weaning 1 week before the beginning of the breeding period on postpartum reproduction. The calving period was 67 days and breeding began 27 days after the end of the calving period and extended for 42 days in November and December. Hereford, Angus and Charolais-cross cows were inseminated artificially approximately 12 hr. after the observation of standing estrus. Weaning increased overall conception in the 42-day breeding period by 25.9% in 2-year-old cows, 15.6% in 3-year-olds and 7.9% in cows 4 years old and older (mature cows). There were 13.8% more 2-year-old cows and 15.6% more mature cows preganant at the end of the first 21 days of breeding in the weaned than in the nonweaned groups, but these differences were not statistically significnt. Weaning increased the percentage of cows exhibiting estrus from calving to the end of the breeding period by 29% in 2-year-olds, 26.7% in 3-year-olds and 16.3% in mature cows. Weaning also increased the percentage of cows exhibiting estrus during the first 21 days of breeding by 39.2% in 2-year-olds and 23.5% in 3-years-olds, but in had no influence or the occurrence of estrus in mature cows. Weaning had no effect on inseminations per conception in the 2- and 3-year-olds, but the mature cows in the weaned group required 0.28 more inseminations per conception than those in the nonweaned group. Among the cows bred, the intervals from calving to first breeding and clving to conception were not decreased by weaning. These intervals were affected by breed of cow and by calving date. The increased percentage of the cows from the weaned group that conceived during the 42-day breeding period was the result of the effects of weaning on the occurrence of estrus, rather than on conception rate among those inseminated.
650 $areproduction
650 $aBovino
650 $aReprodução
653 $aBovine
653 $aPeriod on postpartum
653 $aPeriodo pos-parto
700 1 $aGLIMP, H. A.
700 1 $aGREGORY, K. E.
773 $tJournal of Animal Science$gv.36, n.4, p.734-740, 1973.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Pantanal (CPAP) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 2 | |
| 1. |  | EUCLIDES FILHO, K.; OLSON, T. A.; KOGER, M.; HARGROVE, D. D.; BUTTS, W. T.; GREGORY, K. E.; CUNDIFF, L. V. Genotype by environment interactions on calf performance to weaning. Journal of Animal Science, Champaign, v.61, suppl. 1, p.7, 1985. CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
|   |
| 2. | | CUNDIFF, L. V.; OLSON, T. A.; EUCLIDES FILHO, K.; KOGER, M.; BUTTS, W. T.; GREGORY, K. E. Genotype-environment interactions for reproduction and maternal performance of Bos indicus and Bos taurus crosses in Nebraska and Florida. Beef Research Progress Report, Nebraska, n.4, p.65-66, May, 1993. CNPGC| Biblioteca(s): Embrapa Gado de Corte. |
| |
| Registros recuperados : 2 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
