An unprotected conjugated linoleic acid supplement decreases milk production and secretion of milk components in grazing dairy ewes.
J Dairy Sci
; 95(3): 1437-46, 2012 Mar.
Article
en En
| MEDLINE
| ID: mdl-22365226
ABSTRACT
Feeding conjugated linoleic acid (CLA) in a rumen-inert form to dairy ewes has been shown to increase milk production, alter milk composition, and increase the milk fat CLA content. However, few studies have tested ruminally unprotected CLA sources. The objective of this study was to evaluate the effects of an unprotected CLA supplement (29.8% of cis-9,trans-11 and 29.9% of trans-10,cis-12 isomers as methyl esters) on milk yield and composition of dairy ewes. Twenty-four lactating Lacaune ewes were used in a crossover design and received 2 dietary treatments (1) control basal diet containing no supplemental lipid and (2) basal diet plus CLA (30 g/d). The CLA supplement was mixed into the concentrate and fed in 2 equal meals after morning and afternoon milkings. Each experimental period consisted of 21 d 7 d for adaptation and 14 d for data collection. The CLA supplement decreased milk fat content and yield by 31.3 and 38.0%, respectively. Milk yield and secretion of milk lactose and protein were decreased by 8.0, 9.8, and 5.6%, respectively. On the other hand, milk protein content and linear SCC score were 1.8 and 17.7% higher in ewes fed the CLA supplement. The concentration of milk fatty acids originating from de novo synthesis (
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Lactancia
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Suplementos Dietéticos
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Ácidos Linoleicos Conjugados
/
Leche
Límite:
Animals
Idioma:
En
Revista:
J Dairy Sci
Año:
2012
Tipo del documento:
Article
País de afiliación:
Brasil