Lunesu Mondina Francesca, Decandia Mauro, Molle Giovanni, Atzori Alberto Stanislao, Bomboi Giovanni Cristoforo, Cannas Antonello
Dipartimento di Agraria, Sezione di Scienze Zootecniche, Università degli studi di Sassari, Viale Italia 39, 07100 Sassari, Italy.
Agris Sardegna, Loc. Bonassai, 07100 Sassari, Italy.
Animals (Basel). 2021 Apr 23;11(5):1222. doi: 10.3390/ani11051222.
Evolution of milk production, body reserves and blood metabolites and their relationships with dietary carbohydrates were compared in 30 Sarda dairy ewes and 26 Saanen dairy goats in mid-lactation. From 92 to 152 ± 11 days in milk (DIM), each species was allocated to two dietary treatments: high-starch (HS: 20.0% starch, on DM basis) and low-starch (LS: 7.8% starch, on DM basis) diets. In mid-lactating goats, the HS diet increased fat-corrected milk yield (FCM (3.5%); 2.65 vs. 2.53 kg/d; = 0.019) and daily milk net energy (NE; = 0.025), compared to the LS diet. The body condition score (BCS) was not affected. In mid-lactating ewes, the LS diet increased FCM (6.5%) (1.47 vs. 1.36 kg/d; = 0.008), and NE ( = 0.008), compared to the HS diet. In addition, BCS was greater in HS than in LS ewes (3.53 vs. 3.38; = 0.008). Goats had a higher growth hormone (GH) and lower insulin concentration than ewes (GH: 2.62 vs. 1.37 ng/mL; = 0.04; insulin: 0.14 vs. 0.38 µg/L; < 0.001 in goats and ewes, respectively). In conclusion, in mid-lactation, the two species responded differently to dietary carbohydrates, probably due to differences in the concentration of GH and insulin. The HS diet favored milk yield in goats and body reserve accumulation in ewes. In ewes, the partial replacement of starch with highly digestible fiber increased energy partitioning in favor of milk production.
对30只处于泌乳中期的撒丁岛奶羊和26只萨能奶山羊的产奶量、体储备和血液代谢物的变化及其与日粮碳水化合物的关系进行了比较。在产奶92至152±11天（DIM）期间，每个品种被分配到两种日粮处理：高淀粉（HS：以干物质计20.0%淀粉）和低淀粉（LS：以干物质计7.8%淀粉）日粮。在泌乳中期的山羊中，与LS日粮相比，HS日粮提高了脂肪校正奶产量（FCM（3.5%）；2.65对2.53千克/天；P = 0.019）和每日奶净能（NE；P = 0.025）。体况评分（BCS）未受影响。在泌乳中期的奶羊中，与HS日粮相比，LS日粮提高了FCM（6.5%）（1.47对1.36千克/天；P = 0.008）和NE（P = 0.008）。此外，HS奶羊的BCS高于LS奶羊（3.53对3.38；P = 0.008）。山羊的生长激素（GH）浓度高于奶羊，胰岛素浓度低于奶羊（GH：2.62对1.37纳克/毫升；P = 0.04；胰岛素：0.14对0.38微克/升；山羊和奶羊中P分别<0.001）。总之，在泌乳中期，两个品种对日粮碳水化合物的反应不同，可能是由于GH和胰岛素浓度的差异。HS日粮有利于山羊产奶和奶羊体储备积累。在奶羊中，用高消化率纤维部分替代淀粉增加了能量分配，有利于产奶。
