Data/hora: 06/06/2024 06:00:57

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	22/04/2019	
Data da última atualização: 	06/02/2024	
Autoria: 	CAMPOS, M. M.; BORGES, A. L. DA C. C.; PANCOTI, C. G.; SILVA, R. R. E; MOREIRA, T. S.; LOPES, F. C. F.	
Afiliação: 	MARIANA MAGALHAES CAMPOS, CNPGL; Ana Luiza da Costa Cruz Borges; Carlos Giovani Pancoti; Ricardo Reis e Silva; Tainá Silvestre Moreira; FERNANDO CESAR FERRAZ LOPES, CNPGL.	
Título: 	Performance of Holstein x Gyr dairy cows fed hydrolyzed sugarcane-based diets.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Semina: Ciências Agrárias, Londrina, v. 40, n. 2, p. 807-818, mar./abr. 2019.	
DOI: 	10.5433/1679-0359.2019v40n2p807	
Idioma: 	Inglês	
Conteúdo: 	Twelve multiparous 7/8 Holstein x Gyr dairy cows were fed diets based on chopped sugarcane supplied in natura (control) or after being hydrolyzed (fresh matter basis) for 24 h with 0.5%, 1% or 2% calcium oxide (CaO). The voluntary consumption and digestibility of dietary nutrients, milk production and composition, and feeding behavior of cows were evaluated. A switchback design with three periods, four treatments and three blocks was used. The linear and quadratic effects of the treatments were analyzed using orthogonal contrasts, and the effects were considered significant when P &#8804; 0.05. Compared to the that in the control treatment, the Ca concentration increased by 297%, 570% and 1,083% in the diets including sugarcane hydrolyzed with 0.5%, 1% and 2% CaO, respectively, while the respective Ca:P ratios were 6.58:1, 10.70:1 and 19.77:1 (control Ca:P ratio: 1.55:1). The hydrolysis of sugarcane with increasing amounts of CaO promoted a linear reduction (P < 0.01) in the intake of dry matter (DM), nonfibrous carbohydrates, crude protein (CP), organic matter (OM), neutral detergent fiber corrected for ash and protein (NDFap) and ether extract. The intake of total digestible nutrients, acid detergent fiber (ADF), lignin, hemicelluloses and cellulose presented quadratic behavior (P < 0.01) in response to increasing CaO concentrations used for sugarcane hydrolysis. Increases in the amount of CaO used for sugarcane hydrolysis had no effect on the digestibility of NDFap (P > 0.05), but there were linear reductions (P < 0.05) in the digestibility of DM, OM and ADF; the production of milk corrected or not corrected to 4% fat; and the content of protein, lactose and total solids. Linear reductions (P < 0.05) were also observed in the production of all milk components. Only the milk fat content was not altered (P > 0.05) in response to the inclusion of hydrolyzed sugarcane in the diets. There was no effect (P > 0.05) of sugarcane hydrolysis with increasing amounts of CaO on the time the cows spent idle, ruminating and feeding, but there was a linear increase (P < 0.05) in the minutes spent ruminating 1 kg of DM and NDF. Chopped sugarcane hydrolyzed for 24 h with 0.5% to 2.0% CaO should not be used as exclusive roughage in diets for Holstein x Gyr dairy cows with an average milk production of 10 kg day&#8722;1.	
Palavras-Chave: 	Bovine.	
Thesagro: 	Álcali; Saccharum Officinarum.	
Thesaurus Nal: 	Calcium oxide; Digestibility; Feeding behavior.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/201099/1/Performance-of-Holstein-x-Gyr-dairy-cows-fed-hydrolyzed-Mariana-e-Fernando-2019.pdf	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (24623-1) - UPC - AP - DD -  -  -  - DIS