Data/hora: 21/06/2024 08:52:41

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	01/08/1992	
Data da última atualização: 	31/05/2023	
Autoria: 	COOK, C. W.; STODDART, L. A.; HARRIS, L. E.	
Título: 	The nutritive value of winter range plants in the great basin as determined with digestion trials with sheep.	
Ano de publicação: 	1954	
Fonte/Imprenta: 	Logan, Utah: Utah State University. Utah Agricultural Experiment Station, 1954.	
Série: 	(UAES Bulletins. Paper 331. Bulletin 372).	
Idioma: 	Inglês	
Conteúdo: 	During the winter grazing seasons from 1946 to 1953, studies were carried on throughout the desert ranges of western Utah to determine nutritive content and digestibility of range forage plants. These desert areas receive about 7 inches of precipiation annually and the vegetation consists, chiefly, of saltbush and sagebrush types. The average floral composition of the desert areas studied was about 74 percent browse, 25 percent grass, and 1 percent forbs. However, on some areas there was more grass than browse and, on still others, large quantities of forbs were present, primarily Russian-thistle. Digestion trials were carried out under normal range conditions by the use of the lignin-ratio method. Desert ranges in winter were found to be from borderline to decidedly deficient in digestible protein, phos-phorus, and metabolizable energy. Diets containing appreciable quantity of browse furnished more than 10 times the minimum requirement of carotene, whereas, grass ranges were decidedly deficient in this respect. The diet varied from area to area and was influenced by site, weather conditions, species present, and intensity of use. Of these, intensity of use was of most importance. As degree of utilization increased, the con-tent of desirable nutrients in the diet decreased, and the digestibility was decidedly lowered. In addition, animals consumed less forage daily with increased degree of use. In general, browse plants meet recommended standards for protein requirements and are exceptionally high in carotene. They are, however, slightly deficient in phosphorus and decidedly low in energy furnishing constituents. Grasses are markedly deficient in protein, phosphorus, and carotene but are good sources of energy. Therefore, a mixture of browse and grass in the diet more nearly balances the ration than either forage class alone. Most desert ranges of the Great Basin area can be classed into three broad groups. Some are predominantly grass, whereas others are predomi-nantly browse. The browse may consist primarily of species of sagebrush or primarily of salt-desert shrubs. If the range forage is largely grass, a supplement high in digestible protein and phosphorus should be fed in the winter; whereas, if the range forage is largely sagebrush species, feeds high in energy should be fed. However, if the browse is composed mainly of saltbush species, a supplement of intermediate nature should be fed.	
Palavras-Chave: 	Grassland management.	
Thesagro: 	Digestibilidade; Nutrição; Ovino; Valor Nutritivo.	
Thesaurus Nal: 	Deserts; Digestibility; Forage grasses; Ruminant nutrition; Sheep feeding.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (8089-1) - ADD - FL - DD -  -  -  - DIS