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Memorias de investigación
Research Publications in journals:
Effects of dietary sources of vegetable fats on performance of dairy ewes and conjugated linoleic acid (CLA) in milk
Year:2009
Research Areas
  • Engineering,
  • Marketing
Information
Abstract
Two experiments were carried out to study the effects of supplementing the ration of lactating ewes with vegetable fats (sunflower oil, SO or hydrogenated palm oil, HPO; HIDROPALM®) on diet digestibility, milk yield and milk composition, and on the concentration of the conjugated linoleic acid (CLA) C18:2 cis-9 trans-11 and C18:1 trans-11 (vaccenic acid, VA) and other main fatty acids in milk fat. Treatments involved a control diet, without added oil, and 2 diets supplemented with either 12 g/kg SO or 12 g/kg HPO on a dry matter (DM) basis. In the first experiment, 6 non-pregnant, non-lactating Lacaune ewes were used following a 3×3 replicated Latin Square design. Addition of vegetable fat supplement to the diet increased digestibility of DM, organic matter (OM) and crude protein (CP), but did not affect that of the ether extract (EE), neutral detergent fibre (NDF) or acid detergent fibre (ADF). In the second experiment, 60 Lacaune dairy ewes mid-way through lactation (120±12 days in milk, 0.98±0.03 kg/day average milk yield)were divided into three equalsized groups each of whichwas assigned to one of the three experimental diets for 4weeks. Compared with the control treatment, supplementation with HPO increased milk yield and energy-corrected milk. But neither vegetable fat supplement modified percentages of fat and protein in milk. Supplementation with HPO increased C14:1, C16:1 and C16:0 content and reduced C18:0 and C18:1 cis-9 content in milk fat. Supplementation with SO increased the VA content in milk fat by 36% and that of cis-9 trans-11 CLA by 29% in comparison with the control diet. Supplementation with HPO led to milk fat with 15% more cis-9 trans-11 CLA than control milk. In conclusion, adding a moderate dose of HPO or SO to the diets increased CLA concentration in milk fat. Nevertheless, supplementation with SO was more effective than HPO in increasing CLA concentration in milk fat and reducing the atherogenicity index, improving milk quality from the human health standpoint.
International
Si
JCR
No
Title
Small Ruminant Research
ISBN
0921-4488
Impact factor JCR
0
Impact info
Volume
121
10.1016/j.smallrumres.2009.05.005
Journal number
2
From page
47
To page
53
Month
ABRIL
Ranking
Participants
  • Autor: Vicente Jimeno Vinatea (UPM)
  • Autor: T. CASTRO (UCM)
  • Autor: T. MANSO (UNIV: VALLADOLID)
  • Autor: M. del ALAMO (U. de VALLADOLID)
  • Autor: A.R. MANTECÓN (CSIC)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería de la Calidad Alimentaria
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