Data/hora: 20/06/2024 03:33:49

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	15/04/1999	
Data da última atualização: 	15/04/1999	
Autoria: 	BUTCHER, J. E.; CALL, J. W.; BLAKE, J. T.; SHUPE, J. L.	
Afiliação: 	Utah State University, Logan Utah.	
Título: 	Dietary phosphorus levels can cause problems in beef cows.	
Ano de publicação: 	1979	
Fonte/Imprenta: 	Proceedings, Western Section, American Society of Animal Science, v.30, p.312-314, 1979.	
Idioma: 	Inglês	
Conteúdo: 	Forty-eight 7-month old Hereford heifers, obtained in November 1973, were individually fed for 4 years on a basal ration containing .14% phosphorus (P) or approximately 66% NRC requirements and one-half or 24 of these maturing females were supplemented with monoisodium phosphate to have an average phosphorus intake of .36% or 174% of NRC requirements. During 4 years, there were no significant differences in growth rate, appetite or reproductive rate (3 calvings) and difference in blood, bone and muscle tissues were animal. After the 4 years, one-half of the animals on thew .14% and one-half of the animals on the .36% P were reassigned to a .09% P basal diet and the other 2 treatments were maintained at the previous levels with supplementation of monosodium phosphate. The 21 cows that were put on the reduced level (.09% P) went through the last two-thirds of preganancy, lactation and rebreeding with no apparent adverse effects. Some reduced appetite was noted after 8 months, and after 14 months almost one-half of the cows on the .09% P level had significantly reduced appetites. Necropsy studies on one cow the low level (.09% P) indicated decreased bone density and increased likelihood of fractures. Cows on the .14% P and the .36% P did not have depressed appetite. The 10 cows on the .36% P had a 60% conception rate, as compared to 91% for the 11 cows on the .14% P and 95% conception rate for the 21 cows on the .09% P diet. Urine and fecal studies indicate significantly decreased phosphorus excretion as dietary phosphorus decreases.  	
Palavras-Chave: 	Estudo; Study.	
Thesagro: 	Dieta; Gado de Corte; Nutrição.	
Thesaurus Nal: 	beef cattle; diet; nutrition.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (38223-1) - ADC - SP - -- - SP4644 -  - 4644 - DIS