Área de Producción Animal, ETS Ingenierías Agrarias, Universidad de Valladolid, 34004 Palencia, Spain.
Animal. 2011 Aug;5(10):1659-67. doi: 10.1017/S1751731111000632.
The objective of this study was to evaluate the effects of vegetable oil supplementation of ewe diets on the performance and fatty acid (FA) composition of their suckling lambs. Forty-eight pregnant Churra ewes (mean BW 64.3±0.92 kg) with their 72 newborn lambs (prolificacy=1.5) were assigned to one of four experimental diets, supplemented with 3% of hydrogenated palm (PALM), olive (OLI), soya (SOY) or linseed (LIN) oil. Lambs were nourished exclusively by suckling from their respective mothers. Ewes were milked once daily, and milk samples were taken once a week. When lambs reached 11 kg, they were slaughtered and samples were taken from musculus longissimus dorsi (intramuscular fat) and subcutaneous fat tissue. No changes were observed in milk yield, proximal composition or lamb performance (P>0.10). Milk and lamb subcutaneous and intramuscular fat samples from the PALM diet had the highest saturated fatty acid concentration, whereas those of the OLI, SOY and LIN diets had the lowest (P<0.05). The greatest monounsaturated fatty acid concentration was observed in milk from ewes fed OLI, and the least in milk and in lamb subcutaneous and intramuscular fat samples from LIN and PALM diets. Milk and lamb fat from ewes fed PALM displayed the highest 16:0 proportion and the lowest 18:0 (P<0.05). There were higher concentrations of cis-9 18:1 in OLI samples (P<0.05), more 18:2n-6 in SOY lambs and milk fat (P<0.001) and the highest levels of 18:3n-3 and 20:5n-3 in LIN samples (P<0.01). Milk and lamb subcutaneous and intramuscular samples from SOY and LIN diets contained the most cis-9, trans-11 conjugated linoleic acid, whereas PALM samples had the least (P<0.01). Sheep diet supplementation with different oils, constituting up to 3% of their diets, resulted in changes in the FA composition of milk and the subcutaneous and intramuscular fat of suckling lambs, but did not affect either milk production or lamb performance.
本研究旨在评估在绵羊日粮中添加植物油对哺乳期羔羊生长性能和脂肪酸（FA）组成的影响。48 只怀孕的 Churra 母羊（平均体重 64.3±0.92kg）及其 72 只新生羔羊（繁殖力=1.5）被分为四组进行实验，日粮分别添加 3%氢化棕榈（PALM）、橄榄油（OLI）、大豆（SOY）或亚麻籽油（LIN）。羔羊仅通过吮吸其母羊的奶来喂养。母羊每天挤奶一次，每周采集一次奶样。当羔羊达到 11kg 时，将其屠宰并采集背最长肌（肌间脂肪）和皮下脂肪组织样本。产奶量、乳成分和羔羊生长性能无显著变化（P＞0.10）。与 OLI、SOY 和 LIN 组相比，PALM 组乳和羔羊皮下及肌内脂肪的饱和脂肪酸浓度最高（P＜0.05）。OLI 组乳中发现的单不饱和脂肪酸浓度最高，而 LIN 和 PALM 组乳及羔羊皮下和肌内脂肪中发现的单不饱和脂肪酸浓度最低（P＜0.05）。与 OLI 组相比，PALM 组的 16:0 比例最高，18:0 比例最低（P＜0.05）。OLI 组中 cis-9 18:1 浓度更高（P＜0.05），SOY 组羔羊和乳脂中 18:2n-6 更多（P＜0.001），而 LIN 组中 18:3n-3 和 20:5n-3 含量最高（P＜0.01）。与 SOY 和 LIN 组相比，PALM 组乳和羔羊皮下及肌内脂肪中的 cis-9、trans-11 共轭亚油酸含量最低（P＜0.01）。绵羊日粮中添加不同的油（最高可达 3%）会改变乳和哺乳期羔羊皮下及肌内脂肪的 FA 组成，但不影响产奶量或羔羊生长性能。
