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Rapeseed and sunflower oilcake as supplements for dairy sheep: animal performance and milk fatty acid concentrations

Published online by Cambridge University Press:  07 October 2014

Gustavo Amores ,
Mailo Virto ,
Ana Isabel Nájera ,
Nerea Mandaluniz ,
Josune Arranz ,
María Angeles Bustamante ,
Izaskun Valdivielso ,
Juan Carlos Ruiz de Gordoa ,
Aser García-Rodríguez  and
Luis JR Barron
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Gustavo Amores
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Mailo Virto
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Ana Isabel Nájera
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Nerea Mandaluniz
Affiliation:
Neiker-Tecnalia, P.O. Box 46, 01080 Vitoria-Gasteiz, Spain
Josune Arranz
Affiliation:
Neiker-Tecnalia, P.O. Box 46, 01080 Vitoria-Gasteiz, Spain
María Angeles Bustamante
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Izaskun Valdivielso
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Juan Carlos Ruiz de Gordoa
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Aser García-Rodríguez
Affiliation:
Neiker-Tecnalia, P.O. Box 46, 01080 Vitoria-Gasteiz, Spain
Luis JR Barron*
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
Mertxe de Renobales*
Affiliation:
Lactiker Research Group, Faculty of Pharmacy, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 01006 Vitoria-Gasteiz, Spain
*
*For correspondence; e-mail: [email protected]; [email protected]
*For correspondence; e-mail: [email protected]; [email protected]
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Abstract

The influence of different amounts of oilseed cake (rapeseed and sunflower) on animal production parameters and fatty acid (FA) concentrations of the milk was studied in a Latxa dairy sheep experimental flock, both in winter (50% oilcakes; indoor feeding) and in spring (30% oilcakes; part-time grazing). The two different levels of the oilcakes tested did not affect animal production parameters or milk yield. Milk fat content and the fat/protein ratio decreased significantly with 30 and 50% sunflower cake. Yet, fat/protein ratio values were within the range for cheesemaking. Both levels of either type of oilcake tested significantly increased the concentrations of nutritionally interesting FA (CLA isomer C18:2cis-9, trans-11, vaccenic, oleic, and total unsaturated FA), while simultaneously decreasing the concentration of atherogenic FA. The atherogenicity indexes of milks from ewes fed 50 or 30% of either oilcake were significantly lower than those of their corresponding control. The use of cakes in winter increased the concentration of nutritionally interesting FA to the values obtained with part-time grazing.

Keywords

Ewe's milkfatty acidsmilk nutritional qualityrapeseed oilcakesunflower oilcake
Type
Research Article
Information
Journal of Dairy Research , Volume 81 , Issue 4 , November 2014 , pp. 410 - 416
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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