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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: |
05/12/2023 |
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Autoria: |
LAMBOURNE, L. J.; REARDON, T. F. |
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Título: |
Effect of environment on the maintenance requirements of Merino wethers. |
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Ano de publicação: |
1962 |
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Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 14, n. 2, p. 272-293, 1962. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Small groups of Merino wethers were maintained at virtually constant liveweight in four "environments" and their maintenance feed requirements estimated from the relationship between their fluctuations in liveweight over 14-day periods and their feed intakes, measured directly or estimated by chromium oxide dilution and faecal nitrogen concentration. When adult wethers of equal size but a varying degree of fatness were fed on fresh pasture herbage in metabolism pens, liveweights of 26, 32, and 46 kg could be maintained on a daily intake of approximately 200, 300, and 420 g digestible organic matter (D.O.M.) respectively. When the metabolism pens were placed outdoors in winter the maintenance requirements rose, the rise appearing to be greatest for the thin sheep. When wethers were allowed to graze for about 1½ , 2½, and 4 hr in abundant pasture, liveweights of 26, 33, and 46 kg were maintained on intakes of approximately 420, 480, and 490 g D.O.M. respectively. When the same wethers were allowed to graze freely and weight was controlled by the scarcity or abundance of the pasturage, the same liveweights were maintained on intakes of about 750, 780, and 560 g D.O.M. respectively. The rise in maintenance requirements on short pasture seems too great to be explained by the increased energy cost of locomotion and grazing. The possibility of an endocrine stimulation of metabolic rate is pointed out. |
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Palavras-Chave: |
Endocrine stimulation. |
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Thesagro: |
Bioclimatologia; Meio Ambiente; Nutrição; Ovino. |
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Thesaurus Nal: |
Bioclimatology; Environment; Ruminant nutrition; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02099naa a2200241 a 4500
001 1519648
005 2023-12-05
008 1962 bl uuuu u00u1 u #d
100 1 $aLAMBOURNE, L. J.
245 $aEffect of environment on the maintenance requirements of Merino wethers.
260 $c1962
520 $aAbstract: Small groups of Merino wethers were maintained at virtually constant liveweight in four "environments" and their maintenance feed requirements estimated from the relationship between their fluctuations in liveweight over 14-day periods and their feed intakes, measured directly or estimated by chromium oxide dilution and faecal nitrogen concentration. When adult wethers of equal size but a varying degree of fatness were fed on fresh pasture herbage in metabolism pens, liveweights of 26, 32, and 46 kg could be maintained on a daily intake of approximately 200, 300, and 420 g digestible organic matter (D.O.M.) respectively. When the metabolism pens were placed outdoors in winter the maintenance requirements rose, the rise appearing to be greatest for the thin sheep. When wethers were allowed to graze for about 1½ , 2½, and 4 hr in abundant pasture, liveweights of 26, 33, and 46 kg were maintained on intakes of approximately 420, 480, and 490 g D.O.M. respectively. When the same wethers were allowed to graze freely and weight was controlled by the scarcity or abundance of the pasturage, the same liveweights were maintained on intakes of about 750, 780, and 560 g D.O.M. respectively. The rise in maintenance requirements on short pasture seems too great to be explained by the increased energy cost of locomotion and grazing. The possibility of an endocrine stimulation of metabolic rate is pointed out.
650 $aBioclimatology
650 $aEnvironment
650 $aRuminant nutrition
650 $aSheep
650 $aBioclimatologia
650 $aMeio Ambiente
650 $aNutrição
650 $aOvino
653 $aEndocrine stimulation
700 1 $aREARDON, T. F.
773 $tAustralian Journal of Agricultural Research$gv. 14, n. 2, p. 272-293, 1962.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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