Data/hora: 17/06/2024 19:38:59

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 01/08/1992
Data da última atualização: | 05/12/2023
Autoria: | LAMBOURNE, L. J.; REARDON, T. F.
Título: | Effect of environment on the maintenance requirements of Merino wethers.
Ano de publicação: | 1962
Fonte/Imprenta: | Australian Journal of Agricultural Research, v. 14, n. 2, p. 272-293, 1962.
Idioma: | Inglês
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.
Palavras-Chave: | Endocrine stimulation.
Thesagro: | Bioclimatologia; Meio Ambiente; Nutrição; Ovino.
Thesaurus Nal: | Bioclimatology; Environment; Ruminant nutrition; Sheep.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (5778-1) - ADD - AP - PP - SP 01230 -  - SP 01230 - DIS