Data/hora: 10/06/2024 13:34:32

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 18/09/2017
Data da última atualização: | 18/09/2017
Autoria: | BELL, M. C.; TAYLOR, J. R.; MURPHREE, R. L.
Título: | Effect of feeding stilbestrol and urea on ration digestibility and on retention of calcium, phosphorus, and nitrogen in lambs.
Ano de publicação: | 1957
Fonte/Imprenta: | Journal of Animal Science, v. 16, n. 4, p. 821-827, Nov. 1957.
DOI: | 10.2527/jas1957.164821x
Idioma: | Inglês
Conteúdo: | Twelve wethers fed a fattening-type ration were used in a series of digestion and balance trials to study the effect of adding stilbestrol to a ration containing either urea or cottonseed meal as a protein supplement. This study was divided into six 7-day periods with standard urinary and fecal collections taken during the first, second, fifth and sixth periods. A significantly greater digestibility of crude protein and significantly lower digestibility of ether extract were found for lambs fed rations containing urea as compared with those fed rations containing cottonseed meal. Urea feeding showed no noticeable effect on the retention of calcium, phosphorus or nitrogen. Stilbestrol feeding had no significant effect on the digestibility of ration nutrients. The feeding of stilbestrol significantly increased the daily nitrogen retention during the first seven days (4.9 vs. 3.3 gm.), and there was a higher but non-significant carry-over effect during the 7-day period after stilbestrol feeding was discontinued. Stilbestrol feeding significantly increased calcium and phosphorus retention during the last seven days (1.3 vs. 0.3 gm. for phosphorus), and there was a significant carry-over effect for seven days after stilbestrol feeding was stopped. These results show that urea is utilized by ruminants and that stilbestrol feeding, under the conditions of this metabolism test, increased the retention of calcium, phosphorus and nitrogen by lambs.
Palavras-Chave: | Protein; Stilbestrol.
Thesaurus Nal: | Animal feeding; Animal nutrition; Digestibility; Lambs; Protein concentrates; Sheep.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (34899-1) - ADD - AP - PP -  -  -  - DIS