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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: |
10/06/2025 |
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Autoria: |
YEATES, N. T. M. |
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Título: |
The effect of high air temperature on pregnancy and birth weight in Merino sheep. |
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Ano de publicação: |
1956 |
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Fonte/Imprenta: |
Australian Journal Agricultural Research, v. 7, n. 5, p. 435-439, 1956. |
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DOI: |
https://doi.org/10.1071/AR9560435 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: During the winter of 1954, 21 pregnant Peppin strain Merino ewes were subjected daily, 7 hours a day, 7 days a week, to an air temperature of 105°F dry-bulb, 92°F wet-bulb, in a psychrometric room. Nine of the ewes were heated from the date mating started and the other 12 from the 38th day of pregnancy. Birth weights of the lambs of the two groups showed no significant difference from those of 10 unheated control ewes pregnant during the same period. However, when subjected the following year, for the same period daily throughout the whole of pregnancy, to a higher temperature, namely, 112°F dry-bulb, 98°F wet-bulb, 10 experimental ewes produced lambs having a mean birth weight 1 lb 13 oz less than that of the lambs of eight unheated control ewes. The difference is highly significant statistically. It is concluded that pregnancy in Merinos is adversely affected by extremely high atmospheric temperature; and that this could well explain the low birth weight of lambs born following a summer gestation in tropical Queensland and in certain other parts of Australia when an unusually hot summer occurs. |
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Thesagro: |
Bioclimatologia; Reprodução. |
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Thesaurus Nal: |
Bioclimatology; Birth weight; Ewes; Lambs; Reproductive efficiency. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01788naa a2200217 a 4500
001 1522596
005 2025-06-10
008 1956 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1071/AR9560435$2DOI
100 1 $aYEATES, N. T. M.
245 $aThe effect of high air temperature on pregnancy and birth weight in Merino sheep.$h[electronic resource]
260 $c1956
520 $aAbstract: During the winter of 1954, 21 pregnant Peppin strain Merino ewes were subjected daily, 7 hours a day, 7 days a week, to an air temperature of 105°F dry-bulb, 92°F wet-bulb, in a psychrometric room. Nine of the ewes were heated from the date mating started and the other 12 from the 38th day of pregnancy. Birth weights of the lambs of the two groups showed no significant difference from those of 10 unheated control ewes pregnant during the same period. However, when subjected the following year, for the same period daily throughout the whole of pregnancy, to a higher temperature, namely, 112°F dry-bulb, 98°F wet-bulb, 10 experimental ewes produced lambs having a mean birth weight 1 lb 13 oz less than that of the lambs of eight unheated control ewes. The difference is highly significant statistically. It is concluded that pregnancy in Merinos is adversely affected by extremely high atmospheric temperature; and that this could well explain the low birth weight of lambs born following a summer gestation in tropical Queensland and in certain other parts of Australia when an unusually hot summer occurs.
650 $aBioclimatology
650 $aBirth weight
650 $aEwes
650 $aLambs
650 $aReproductive efficiency
650 $aBioclimatologia
650 $aReprodução
773 $tAustralian Journal Agricultural Research$gv. 7, n. 5, p. 435-439, 1956.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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