Ptáček Martin, Milerski Michal, Stádník Luděk, Ducháček Jaromír, Tančin Vladimír, Schmidová Jitka, Uhrinčať Michal, Michlová Tereza, Nohejlová Lenka
Department of Animal Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 16500 Prague-Suchdol, Czech Republic.
Genetics and Breeding of Farm Animals, Institute of Animal Science, Přátelství 815, 10401 Prague-Uhříněves, Czech Republic.
Animals (Basel). 2019 Sep 24;9(10):718. doi: 10.3390/ani9100718.
This study determined effects of milk production, milk components, or fatty acids (FA) profile on live weight of suckling lambs till their weaning. Live weight (LW, kg) of 42 purebred Wallachian lambs (from 33 ewes) was recorded during four control days with approximately 30-day intervals during rearing. At the same time, their mothers were examined for milk production (kg), milk fat (g), proteins (g), lactose (g), and fatty acids (%) contents. Results investigated using linear regression analysis showed 5.93 kg ( < 0.05) increase of lambs LW corresponded with 1 kg of ewe's daily milk production increase during the observed period. Similarly, significant 0.13 kg or 0.11 kg increases of lambs live weight corresponded with 1 g increase of milk protein or milk lactose at this time. Milk with higher prevalence of trans-palmitoleic acid, trans-vaccenic acid, cis-vaccenic acid, linolelaidic acid, linoleic acid, or conjugated linolenic acid (CLA) significantly improved lambs LW. Moreover, significantly positive Pearson partial correlation between LW and trans-vaccenic acid (r = 0.305) or CLA (r = 0.347) indicated on genetic correlation between these traits. Therefore, milk (natural or artificially supplied) with higher distribution of these specified FAs could improve lambs' LW.
本研究确定了产奶量、乳成分或脂肪酸（FA）谱对哺乳羔羊断奶前体重的影响。在饲养期间，对42只纯种瓦拉几亚羔羊（来自33只母羊）的体重（LW，kg）进行了4次对照日记录，间隔约30天。同时，对它们的母亲进行了产奶量（kg）、乳脂肪（g）、蛋白质（g）、乳糖（g）和脂肪酸（%）含量的检测。使用线性回归分析的结果表明，在观察期内，母羊日产奶量每增加1 kg，羔羊体重增加5.93 kg（P<0.05）。同样，此时乳蛋白或乳糖每增加1 g，羔羊体重显著增加0.13 kg或0.11 kg。反式棕榈油酸、反式vaccenic酸、顺式vaccenic酸、亚油酸、亚麻酸或共轭亚麻酸（CLA）含量较高的乳显著提高了羔羊体重。此外，LW与反式vaccenic酸（r = 0.305）或CLA（r = 0.347）之间显著的正皮尔逊偏相关表明了这些性状之间的遗传相关性。因此，这些特定脂肪酸分布较高的乳（天然或人工供应）可以提高羔羊体重。
