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Biblioteca(s):  Embrapa Caprinos e Ovinos.
Data corrente:  09/10/2008
Data da última atualização:  31/05/2013
Autoria:  HOLMES, C. W.; KAMOTE, H.; MACKENZIE, D. D. S.; MOREL, P. C. H.
Título:  Effects of a decrease in milk yield, caused by once-daily milking or by restricted feeding, on the somatic cell count in milk from cows with or without subclinical mastitis.
Ano de publicação:  1996
Fonte/Imprenta:  Australian Journal of Dairy Technology, v. 51, n. 1, p. 8-10, Apr. 1996.
Idioma:  Inglês
Conteúdo:  1. Two experiments were carried out with grazing Holstein Friesian cows which had either low somatic cell counts (SCC) or high SCC before the treatment period began. They were designed to measure the effects of two factors, other than bacterial infection, on SCC. In experiment 1, 32 cows in mid lactation were subjected to a 3 week experimental period of either generous or severely restricted feeding. In experiment 2, 36 cows in late lactation were subjected to a 4 week experimental period of either twice daily or once daily milking. 2. The yield, composition and SCC in milk from each cow were measured twice weekly, and the bacteriological status of each quarter was examined on two days before and after the experimental period. 3. In both experiments the cows with high initial SCC had a higher proportion of quarters which were infected, some with major pathogens, while none of the cows with low initial SCC had quarters which shed major pathogens. 4. In experiment 1, the large decrease in milk yield (-30%) caused by the restricted level of feeding had no consistent effect on the yield of somatic cells or the SCC. However, the decrease in milk yield was associated with decreases in the yield of somatic cells and the SCC in the cows with low initial SCC but relative increases in the cows with high initial SCC; and the interactions were significant (P < 0.05; 0.12). 5. In experiment 2, once daily milking caused a larger decrease in daily milk yield in cows with the high initial S... Mostrar Tudo
Palavras-Chave:  Bovino de leite; Célula somática; Contaminação biológica; Mastite.
Thesagro:  Diagnostico; Lactação; Ordenha.
Categoria do assunto:  --
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Caprinos e Ovinos (CNPC)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CNPC21490 - 1ADDSP - PPSP 04262SP 04262
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