Data/hora: 09/06/2024 09:43:26

Provedor de dados: 	65	
País: 	Brazil	
Título: 	Milk composition of Holstein cows: a retrospective study	
Autores: 	Bondan,Carlos; Folchini,Jéssica Aneris; Noro,Mirela; Quadros,Daniel Lazzari; Machado,Karine Martini; González,Félix Hilário Diaz.	
Data: 	2018-01-01	
Ano: 	2018	
Palavras-chave: 	Milk quality; Lactation number; Seasonality; Stage of lactation.	
Resumo: 	ABSTRACT:  Worldwide, milk analysis is an satisfactory measurement of milk quality on dairy farms. Milk composition is the base for payment systems, so knowledge of its characteristics at different periods is essential for modern dairy producer. The aim of the study was to evaluate the effects of year, season, stage of lactation, and lactation number on variations in milk yield and composition of Holstein cows (n=148,604). Milk yield estimated by multiple regression was 25,50L/cow/day. Winter was the season with the highest milk yield and the highest protein and lactose content. Milk fat was highest in the fall, in cows in late lactation and also in primiparous cows. Lactating cows from 6 to 60 days in lactation and those in 2nd or 3rd lactation showed the highest milk yield. Lactose concentration was positively correlated with milk yield. Somatic cell score was negatively correlated with milk yield and with lactose concentration. Most important variations in milk characteristics occur among seasons, lactation stages and parities. Mammary gland health is yet the greatest challenge to be overcome.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200650	
Editor: 	Universidade Federal de Santa Maria	
Relação: 	10.1590/0103-8478cr20180123	
Formato: 	text/html	
Fonte: 	Ciência Rural  v.48 n.12 2018	
Fonte: 	info:eu-repo/semantics/openAccess