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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
08/11/2023 |
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Autoria: |
LINDSAY, D. R.; ROBINSON, T. J. |
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Título: |
Studies on the efficiency of mating in the sheep. II. The effect of freedom of rams, paddock size, and age ewes. |
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Ano de publicação: |
1961 |
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Fonte/Imprenta: |
The Journal of Agricultural Science, v. 57, n. 1, p. 141-145, Aug. 1961. |
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DOI: |
https://doi.org/10.1017/S0021859600050127 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: A factorial experiment is described in which thirty-six aged and thirty-six maiden spayed crossbred ewes were used in four successive tests at intervals of 15 days in a study of factors affecting the detection of oestrus. Variates introduced into each test were: (a) freedom of rams (free or tethered); (b) size of mating paddock (17 acres or ? acre); (c) age of ewe (maiden or aged); and (d) dose of oestrogen (oestradiol benzoate, ODB: 10·0, 15·6, 24·4 ?g.). All ewes were primed with progesterone for 12 days prior to ODB injection and joining. The number of ewes detected in oestrus and the number and identity of rams which served each ewe were recorded. In the four successive tests 29, 33, 36 and 30 ewes were served. Significant main effects were: (a) freedom of rams?free 77, tethered, 51 (P < 0·001); (b) size of mating paddock?17 acres 49, ? acre 79 (P < 0·001); (c) age of ewes?aged 57, maiden 71 (P < 0·05); and (d) dose of ODB?10·0 ?g., 20; 15·6 ?g., 41; 24·4 ?g., 67 (P < 0·001). Significant interactions were: (a) test number × age (P = 0·01), and (b) test number × dose of ODB (P < 0·05). The number of maiden ewes served increased and that of aged ewes decreased withsuccessive tests. There was a barely significant ohange in the slope of the ODB D/R line. Ewes showed no obvious preference for tethered rams of any particular breed. There was a positive correlation between the performance of rams when free and tethered. |
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Palavras-Chave: |
Comportamento reproductivo; Manejo reprodutivo; Paddocks. |
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Thesagro: |
Comportamento animal; Comportamento sexual; Estradiol; Ovino; Reprodução animal. |
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Thesaurus Nal: |
Animal reproduction; Crossbreds; Ewes; Progesterone; Reproductive behavior; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02435naa a2200313 a 4500
001 1523225
005 2023-11-08
008 1961 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1017/S0021859600050127$2DOI
100 1 $aLINDSAY, D. R.
245 $aStudies on the efficiency of mating in the sheep. II. The effect of freedom of rams, paddock size, and age ewes.$h[electronic resource]
260 $c1961
520 $aAbstract: A factorial experiment is described in which thirty-six aged and thirty-six maiden spayed crossbred ewes were used in four successive tests at intervals of 15 days in a study of factors affecting the detection of oestrus. Variates introduced into each test were: (a) freedom of rams (free or tethered); (b) size of mating paddock (17 acres or ? acre); (c) age of ewe (maiden or aged); and (d) dose of oestrogen (oestradiol benzoate, ODB: 10·0, 15·6, 24·4 ?g.). All ewes were primed with progesterone for 12 days prior to ODB injection and joining. The number of ewes detected in oestrus and the number and identity of rams which served each ewe were recorded. In the four successive tests 29, 33, 36 and 30 ewes were served. Significant main effects were: (a) freedom of rams?free 77, tethered, 51 (P < 0·001); (b) size of mating paddock?17 acres 49, ? acre 79 (P < 0·001); (c) age of ewes?aged 57, maiden 71 (P < 0·05); and (d) dose of ODB?10·0 ?g., 20; 15·6 ?g., 41; 24·4 ?g., 67 (P < 0·001). Significant interactions were: (a) test number × age (P = 0·01), and (b) test number × dose of ODB (P < 0·05). The number of maiden ewes served increased and that of aged ewes decreased withsuccessive tests. There was a barely significant ohange in the slope of the ODB D/R line. Ewes showed no obvious preference for tethered rams of any particular breed. There was a positive correlation between the performance of rams when free and tethered.
650 $aAnimal reproduction
650 $aCrossbreds
650 $aEwes
650 $aProgesterone
650 $aReproductive behavior
650 $aSheep
650 $aComportamento animal
650 $aComportamento sexual
650 $aEstradiol
650 $aOvino
650 $aReprodução animal
653 $aComportamento reproductivo
653 $aManejo reprodutivo
653 $aPaddocks
700 1 $aROBINSON, T. J.
773 $tThe Journal of Agricultural Science$gv. 57, n. 1, p. 141-145, Aug. 1961.
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| 1. |  | ASADA, M.; TAKEDA, M.; TOMAS, W. M.; PELLEGRIN, A. O.; OLIVEIRA, C. H. S. de; BARBOSA, J. D.; SILVEIRA, J. A. G. da; BRAGA, E. M.; KANEKO, O. Close relationship of Plasmodium sequences detected from South American pampas deer (Ozotoceros bezoarticus) to Plasmodium spp. in North American white-tailed deer. International Journal For Parasitology: parasites and wildlife, v. 7, p. 44-47, 2018.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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