Data/hora: 16/06/2024 01:34:04

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	30/03/1998	
Data da última atualização: 	30/03/1998	
Autoria: 	HILL, W. J.; SECRIST, D. S.; OWENS, F. N.; STRASIA, C. A.; GILL, D. R.; BASALAN, M.; JOHNSON, A. B.	
Título: 	Effects of trace mineral supplements on performance of feedlot steers.	
Ano de publicação: 	1996	
Fonte/Imprenta: 	Animal Science Research Report, p.153-163, Dec., 1996.	
Idioma: 	Inglês	
Conteúdo: 	Response of steers to trace minerals was examined in a 218 d feedlot trial using 72 crossbred steer calves (501 Ib initially) in 12 pens. Control steers received no supplemental Co, Cu, Mn or Zn; 4-Plex steers received organic forms of these minerals; steers received only inorganic forms of these four minerals. The 95% concentrate diet consisted of whole corn, cottonseed meal, urea, and 5% cottonseed hulls. Co, Cu, Mn and Zn of the control diet were .08, 4.3, 20, and 26 ppm; supplemented diets had 2.8, 13.9, 22, and 40 ppm; NRC recommends .02, 8, 40, and 30 ppm. Durin the first 104 d and averaged over the total trial, diet did not alter performance. But during the last 114 d, ADG was greater for steers receiving trace minerals, intake tended to be lower for 4-Plex than inorganic steers, and feed: gain was slightly better for 4-Plex than inorganic or control steers. Carcass characteristics did not differ. Added trace mineral tended to increase Cu in blood and liver and Zn in blood. Compared with steers fed inorganic forms, 4-Plex steers had higher liver Co. Liver Mn was notably low. Apparently, these newly weaned calves had adequate stores of these trace minerals for normal feedlot performance for several months but rate of gain stalled later when minerals were not added. The 7% efficiency advantage for steers fed 4-Plex over steers fed inorganic minerals late in the study may reflect a metabolic advantage or simply dietary inadequacy of inorganic minerals.	
Palavras-Chave: 	Key words; Micronutriente; Suplementacao; Trace minerals.	
Thesagro: 	Confinamento; Mineral; Performance.	
Thesaurus Nal: 	steers.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (3373-1) - ADC - SP - -- - S 11398 -  - S 11398 - DIS