Effects of Energy and Protein Content in the Diet on Milk Yield and Milk Fatty Acid Profile in Dairy Ewes (original) (raw)
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Journal of New Sciences, 2014
1 Regional Filed crops Research Center Beja, Tunisia 2 Department of Animal Productions, Higher Institute of Agriculture of Mateur, Tunisia * Corresponding E-mail: houcine_selmi@live.fr Summary The objective of this study is to evaluate the effect of the use of local raw materials in the diet of dairy sheep production and chemical composition of milk. For this, twenty-four (24) Sicilo-Sarde dairy ewes were divided into two homogeneous lots (lot B and lot T) by age (5.25 ± 1.21 vs. 5.83 ± 1.89 years); litter size (1.5); body weight (32.9 ± 2.96 kg vs. 33.26 ± 3.01 kg); lactation number (4.25 ± 1.21 vs. 4.83 ± 1.89) and production level (0.320 l / day). The sheep from the two groups were fed basic oat hay 1.5 kg DM / ewe / day supplemented by two concentrate feed at the rate of 500 g / ewe / day. The first is the concentrated feed (B): 30% faba bean, 66% barley and 4% VMC, the second is a concentrated food (T): 30% faba bean, 66% triticale and 4% VMC. Both concentrates are iso energy ...
Quality improvement of Slovak ewe milk based on the content of health affecting fatty acid compounds
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Small Ruminant Research, 2011
Milk in the udder can be split into two fractions: available, obtained after conventional milking and residual, which can only be removed after oxytocin injection or suckling by the offspring. In order to compare the chemical composition, mainly the fatty acid (FA) profile, of available and residual ovine milk, thirty-two ewes, divided into four treatments and fed with diets supplemented with 3% of palm, olive, soybean and linseed oil, were milked before and after intravenous oxytocin injection. Residual milk represents almost 12% of total milk, and its fat percentage was higher than that for available milk (11.7 vs 8.8%). Although FA composition was modified by the diets, only a slight decrease in 16:0 content was observed in residual milk with respect to available milk in the four diets assayed. Therefore, despite large differences in fat content, the FA profiles for available and residual ewe milk do not differ.
Animal Feed Science and Technology, 2006
This review discusses current knowledge of the main nutritional factors that influence composition of sheep milk and, consequently, its processing into cheese, with special focus on milk fat and protein concentration and characteristics, content of bioactive compounds, somatic cell content, content of aromatic compounds able to improve its organoleptic characteristics and content of toxic substances. Sheep milk composition is strongly influenced by ewe nutrition, especially in highly productive animals. Milk fat concentration is markedly affected by the ewe's net energy (NE) balance, dietary NDF content and dietary supplementation with ruminally protected/inert or unprotected marine and vegetable oils. Milk fat composition can be modified to contain higher levels of human healthy fatty acids (FA), such as conjugated linoleic acid and omega-3 FA.
Effect of feeding regimen on the fatty acid profile of sheep bulk tank milk
International Journal of Dairy Technology, 2018
The quality of dairy products is affected by the fatty acid (FA) profile of the milk. The aim of this study was to determine whether the feeding regimen and lactation stage of the sheep produced a healthier FA profile of milk. The study was carried out on 30 commercial farms, and the feeding regimens studied were different grazing allowances (50%, G1; 25%, G2; 0%, G3). The variance explained by the lactation stage for the FAs was below 4.18%. The milk from the grazing allowance G1 (50% grazing time per day plus alfalfa silage and barley grains) showed a higher conjugated linoleic acid (1.16%) proportion, followed by the grazing allowances G2 (0.90%) and G3 (0.79%), which showed that grazing improved the nutritional quality of milk fat.
Journal of dairy science, 2011
The study tested the hypothesis that certain underused forages and agro-industrial byproducts available in dry areas may positively influence fatty acid (FA) composition and antioxidative properties of milk by their contents of residual oil or phenolic compounds or both. Sixty multiparous fat-tailed Awassi ewes were allocated to 6 groups in a completely randomized block design. During 50 d, the ewes were group-fed 2.5 kg of dry matter/d per ewe 1 of 6 isonitrogenous and isoenergetic diets (forage:concentrate, 0.3:0.7). The test feeds, comprising 30% of the diets, replaced either barley straw [lentil straw, olive leaves, and Atriplex (saltbush) leaves, rich in phenolic compounds or electrolytes] or conventional concentrate ingredients (olive cake and tomato pomace; ∼10% lipids) from the control diet. The diets containing olive cake and tomato pomace were rich in oleic acid (18:1 cis-9; 27% of total dietary FA) and linoleic acid (18:2 cis-9,cis-12; 37%), respectively. Profiles of FA w...
Applied Sciences
The quality of milk is fundamental to producing safe milk and dairy products that are suitable for consumption. The objective of this study was to determine the influence that the content of dietary polyunsaturated fatty acids (PUFA) has on the total mixed ration (TMR) and lactation stage of milk’s composition and the fatty acid profile (FA) of the dairy Najdi breed. During the lactation period, 48 Najdi ewes used the following four treatments: traditional feed (TR) and three total mixed rations (TMR1, TMR2, and TMR3) with different PUFA content. Milk samples were taken from whole milk in the morning. The chemical composition and FA profile were analyzed. The results show that the ewes fed TMR1 with a PUFA content (25.20%) produced high-quality milk as they contained high levels of polyunsaturated fatty acids (PUSF), linoleic acid (LA), α-linolenic acid (ALA) and omega-3 (n3). On the other hand, the milk of ewes fed TMR2 with PUFA (15.06%) contained high levels of unsaturated fatty ...
Revista de Chimie
This research was conducted to study fatty acids composition, especially content of n-3 FA; c9,t11-CLA (rumenic acid) and t11-C18:1 (vaccenic acid) and health lipid indices of milk according to the feeding practices in sheep. The exeperimental diets consisted of: P - pasture without any diet supplementation, PC - pasture + standard concentrate (500 g/d), PCs - pasture + fat-enriched concentrate (camelina seed-based concentrate: 500 g/d). Camelina seeds (Cs - Camelina sativa L) were used to increase the beneficial FA concentration in milk fat. PC diet as compared to P diet increases daily milk yield and the content of milk fat, but it adversely affects the quality of milk fats. Fat in the milk of PC ewes had a higher content of hypercholesterolemic FA, while the polyunsaturated FA (PUFA) concentration decreased (p [ 0.001). The use Cs in the concentrate mixture (PCs diet) increased by more than double the c9,t11-CLA, C20:5n-3 (EPA), C22:6n-3 (DHA), C18:3n-3 (ALA) and t11-C18:1 (VA) (...
Czech Journal of Animal Science
Test-day records of purebred Tsigai, Improved Valachian and Lacaune ewes were used to analyse the effect of environmental factors on milk fat and protein content. There were 121 424 and 121 158 measurements of fat and protein content for Tsigai, 247 742 and 247 606 measurements of fat and protein content for Improved Valachian and 2 194 measurements of fat and protein content for Lacaune ewes lambing between 1995 and 2005. Overall means and standard deviations for fat and protein content were 7.77 ± 1.606% and 5.94 ± 0.690% for Tsigai, 7.48 ± 1.446% and 5.82 ± 0.620% for Improved Valachian, and 6.97 ± 1.514% and 5.62 ± 0.692% for Lacaune. For fat content, analyses showed a highly significant ( P < 0.01) effect of flock-test day and a highly significant ( P < 0.01) or significant ( P < 0.05) effect of the month of lambing, with the only exception of the month of lambing in Lacaune. The effect of litter size was highly significant ( P < 0.01) or significant ( P < 0.05) ...