Bottger J D, Hess B W, Alexander B M, Hixon D L, Woodardt L F, Funston R N, Hallford D M, Moss G E
Department of Animal Science, University of Wyoming, Laramie 82071, USA.
J Anim Sci. 2002 Aug;80(8):2023-30. doi: 10.2527/2002.8082023x.
Primiparous Angus x Gelbvieh (n = 36) rotationally crossed beef cows (initial BW = 487.9 +/- 10.5 kg, body condition score = 5.5 +/- 0.02) were utilized to determine effects of supplemental safflower seeds high in linoleic (76% 18:2) or oleic (72% 18:1) acid on cow BW change, body condition score, milk production and composition, calf weight gain, cow serum metabolites, and metabolic hormones. On d 3 postpartum, cows were randomly assigned to one of three isonitrogenous dietary supplements with equal total quantity of TDN: corn-soybean control supplement (n = 12); high-linoleate safflower seeds (n = 12); or high-oleate safflower seeds (n = 12). Safflower-seed supplements were formulated to provide 5% DMI as fat. Supplements were individually fed from d 3 postpartum through 90 d postpartum. Cows had ad libitum access to native grass hay (7.8% CP), trace-mineralized salt, and water. Date of parturition was evenly distributed across treatments with all cows calving within 14 +/- 0.8 d. There were no differences (P = 0.65) in total OM intake among treatments. Although cow BW change did not differ (P = 0.33) by treatment, supplementation influenced cow body condition score (P = 0.02) with linoleate-supple-mented cows in higher (P = 0.005) condition overall than oleate-supplemented cows (5.1 +/- 0.06 vs 4.9 +/- 0.06). Twenty-four-hour milk production did not differ (P = 0.68) among treatments. Percentage milk fat was not different at d 30; however, at d 60 and d 90 percentage milk fat was greater (P ( 0.05) in control and oleate-supplemented cows than in linoleate-supplemented cows. Calf BW gains (P = 0.27) and adjusted 205-d weights (P = 0.48) were not affected by supplement treatment. Supplementation did not influence serum concentrations of glucose (P = 0.38), NEFA (P = 0.61), GH (P = 0.29), IGF-I (P = 0.81), insulin (P = 0.26), or IGF-I binding proteins (P > or = 0.11). Days to conception did not differ (P = 0.40) among treatments. Although overall productivity of the primiparous cows and their calves was not altered by safflower-seed supplementation, differential effects were noted between supplements. Oleate supplementation increased percentage milk fat at d 60, and cow body condition score was lower than in linoleate-supplemented cows. Linoleate-supplemented cows had greater body condition scores by 90 d postpartum than either corn-soybean- or oleatesupplemented cows.
选用初产的安格斯×吉尔维牛杂交肉牛（n = 36）（初始体重 = 487.9±10.5千克，体况评分 = 5.5±0.02），以确定补充富含亚油酸（76% 18:2）或油酸（72% 18:1）的红花籽对母牛体重变化、体况评分、产奶量及乳成分、犊牛体重增加、母牛血清代谢物和代谢激素的影响。产后第3天，将母牛随机分为三种等氮日粮补充剂组之一，三种日粮的总可消化养分（TDN）总量相等：玉米 - 大豆对照补充剂组（n = 12）；高亚油酸红花籽组（n = 12）；或高油酸红花籽组（n = 12）。红花籽补充剂的配方是使其提供占干物质采食量（DMI）5%的脂肪。从产后第3天到产后90天，对补充剂进行单独投喂。母牛可自由采食天然禾本科干草（粗蛋白含量7.8%）、微量矿物质盐和水。产犊日期在各处理间均匀分布，所有母牛在14±0.8天内产犊。各处理间的总有机物质摄入量无差异（P = 0.65）。尽管不同处理间母牛体重变化无差异（P = 0.33），但补充剂影响了母牛体况评分（P = 0.02），总体上，补充亚油酸的母牛体况高于补充油酸的母牛（P = 0.005）（分别为5.1±0.06和4.9±0.06）。各处理间24小时产奶量无差异（P = 0.68）。第30天时乳脂百分比无差异；然而，在第60天和第90天，对照和补充油酸的母牛乳脂百分比高于补充亚油酸的母牛（P < 0.05）。犊牛体重增加（P = 0.27）和校正后的205天体重（P = 0.48）不受补充剂处理的影响。补充剂未影响血清葡萄糖浓度（P = 0.38）、非酯化脂肪酸（P = 0.61）、生长激素（P = 0.29）、胰岛素样生长因子 - I（IGF - I）（P = 0.81）、胰岛素（P = 0.26）或IGF - I结合蛋白（P≥0.11）。各处理间受孕天数无差异（P = 0.
