Tufarelli Vincenzo, Petrera F, Khan R U, Laudadio Vito
Department of Animal Health and Welfare, Faculty of Veterinary Medicine, University of Study of Bari Aldo Moro, Strada Provinciale per Casamassima km 3, Valenzano, BA, Italy.
Trop Anim Health Prod. 2011 Jun;43(5):955-60. doi: 10.1007/s11250-011-9789-1. Epub 2011 Feb 18.
A study was carried out to evaluate the influence of vitamin and trace mineral supplementation on milk production and composition in grazing dairy ewes during the dry season. Ewes (n = 50) were assigned at weaning to blocks and treatments. Ewes were daily conducted (8 h/day) on a pasture based on Italian ryegrass (Lolium multiflorum). At fold, ewes received a basal diet composed by ad libitum oat hay and a definite amount of a pelleted concentrate. Dietary treatments included: (1) the control concentrate containing background of vitamin and trace mineral only, and (2) the experimental concentrate containing the premix supplement (10 g/kg of dry matter). Vitamin and trace mineral supplementation did not affect ewes' body weight. Milk, fat- and protein-corrected milk, fat percentage, and clotting properties were improved in ewes fed supplemented concentrate. There was a week × treatment interaction (P < 0.05) for yield of milk and corrected milk that was greatest at peak production in ewes fed the premix. Our findings indicate that in grazing dairy ewe, the dietary vitamin and trace mineral supplementation during dry season led to an increase of milk production and quality, with positive improvement in milk clotting aptitude.
开展了一项研究，以评估在旱季补充维生素和微量矿物质对放牧奶羊产奶量及奶成分的影响。母羊（n = 50）在断奶时被分配到不同组块和处理中。母羊每天（每天8小时）在以意大利黑麦草（多花黑麦草）为基础的牧场上放牧。在羊舍，母羊自由采食燕麦干草并采食一定量的颗粒精饲料作为基础日粮。日粮处理包括：（1）仅含基础维生素和微量矿物质的对照精饲料，以及（2）含有预混料补充剂（10克/千克干物质）的试验精饲料。补充维生素和微量矿物质并未影响母羊体重。采食补充精饲料的母羊产奶量、乳脂和乳蛋白校正乳量、乳脂率及凝乳特性均得到改善。对于产奶量和校正乳量，存在周×处理交互作用（P < 0.05），在采食预混料的母羊产奶高峰期时该交互作用最为明显。我们的研究结果表明, 在旱季放牧的奶羊中，日粮补充维生素和微量矿物质可提高产奶量和奶品质，并对乳凝能力有积极改善作用。
