|
Registro Completo |
|
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
|
Data corrente: |
01/08/1992 |
|
Data da última atualização: |
11/06/2025 |
|
Autoria: |
HART, D. S. |
|
Título: |
Photoperiodicity in Suffolk sheep. |
|
Ano de publicação: |
1950 |
|
Fonte/Imprenta: |
The Journal of Agricultural Science, v. 40, n. 1/2, p. 143-149, Jan. 1950. |
|
Idioma: |
Inglês |
|
Conteúdo: |
1. A gradually decreasing plane of light and increasing plane of darkness is not an essential factor for stimulating the onset of oestrus in sheep. 2. Sheep being short-day breeding animals, a standard and regularly maintained rhythm of short-light and long-dark will stimulate the onset of oestrus. 3. The terms short and long are used in the relative sense only, since their significance is solely a means of supplying the necessary contrast impulse to the pituitary gland. 4. A ratio of 1 part of light to 2 parts or more of dark is sufficient to supply the contrast effect. 5. Oestrous cycles induced by artificial light rhythms appear to be normal in all respects, con forming to the normal intervals between heat periods and associated with the ovulation of normal ova. 6. The anoestrous period varies in depth, and sheep which have just entered it may be brought back into oestrus very much faster than animals which are in deep anoestrum. 7. The milk yield of lactating ewes does not appear to be unduly depressed by the onset of oestrous periods induced by an artificial light-dark rhythm. |
|
Palavras-Chave: |
Oestrus. |
|
Thesagro: |
Fisiologia; Ovino; Reprodução. |
|
Thesaurus Nal: |
Estrous cycle; Pituitary gland; Reproduction; Suffolk (sheep breed). |
|
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
|
Marc: |
LEADER 01682naa a2200217 a 4500
001 1522711
005 2025-06-11
008 1950 bl uuuu u00u1 u #d
100 1 $aHART, D. S.
245 $aPhotoperiodicity in Suffolk sheep.$h[electronic resource]
260 $c1950
520 $a1. A gradually decreasing plane of light and increasing plane of darkness is not an essential factor for stimulating the onset of oestrus in sheep. 2. Sheep being short-day breeding animals, a standard and regularly maintained rhythm of short-light and long-dark will stimulate the onset of oestrus. 3. The terms short and long are used in the relative sense only, since their significance is solely a means of supplying the necessary contrast impulse to the pituitary gland. 4. A ratio of 1 part of light to 2 parts or more of dark is sufficient to supply the contrast effect. 5. Oestrous cycles induced by artificial light rhythms appear to be normal in all respects, con forming to the normal intervals between heat periods and associated with the ovulation of normal ova. 6. The anoestrous period varies in depth, and sheep which have just entered it may be brought back into oestrus very much faster than animals which are in deep anoestrum. 7. The milk yield of lactating ewes does not appear to be unduly depressed by the onset of oestrous periods induced by an artificial light-dark rhythm.
650 $aEstrous cycle
650 $aPituitary gland
650 $aReproduction
650 $aSuffolk (sheep breed)
650 $aFisiologia
650 $aOvino
650 $aReprodução
653 $aOestrus
773 $tThe Journal of Agricultural Science$gv. 40, n. 1/2, p. 143-149, Jan. 1950.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
