Lourencon Raquel Vasconcelos, Patra Amlan Kumar, Puchala Ryszard, Dawson Lionel James, Ribeiro Luana Paula Dos Santos, Encinas Fabiola, Goetsch Arthur Louis
American Institute for Goat Research, Langston University, Langston, OK 73050, USA.
College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078, USA.
Animals (Basel). 2023 Feb 18;13(4):735. doi: 10.3390/ani13040735.
This study was conducted to assess effects of the nutritional plane before and during breeding on feed intake, body weight (BW) change, reproductive performance, body condition score (BCS), body mass indexes (BMI), and body composition of three breeds of hair sheep. Twenty-five Dorper, 27 Katahdin, and 33 St. Croix ewes were allocated to groups and treatments based on initial BW and age. Supplementation treatments were soybean meal fed at 0.16% BW (LS) and a mixture of 25% soybean meal and 75% ground corn given at 0.8% BW (HS; dry matter basis) for 88 to 102 days including 17 days after breeding. Wheat straw intake (% BW) was greater ( < 0.01) for LS than for HS. Average daily gain and BCS change were similar among breeds, but both were greater for HS vs. LS. Birth rate, litter size, total litter birth weight, gestation length, and number of services were similar among breeds ( > 0.05), although individual lamb birth weight was lower for St. Croix than for Katahdin ( < 0.05). None of these reproductive variables were influenced by treatment or the breed × treatment interaction ( > 0.05). There were no breed differences in whole body concentrations of water, fat, protein, ash, or energy in week 0 or 4, but in 8 week concentrations of water, protein, and ash were greatest among breeds for St. Croix ( < 0.05) and levels of fat and energy were lower for St. Croix than for Dorper ( < 0.05). In week 8, total amounts and concentrations of fat and energy were greater for HS vs. LS and those of water, protein, and ash were less for HS ( < 0.05). There were interactions ( < 0.05) between treatment and period in blood concentrations of cholesterol and non-esterified fatty acids and between breed, treatment, and period in level of triglycerides and total antioxidant capacity. The concentration of cortisol was greater for HS vs. LS ( < 0.05). In conclusion, supplementation did not influence reproductive performance despite differences in BW and BCS change, which may be due to the initial moderate BCS and greater wheat straw intake for the LS treatment.
本研究旨在评估繁殖前及繁殖期间的营养水平对三个品种毛用绵羊的采食量、体重（BW）变化、繁殖性能、体况评分（BCS）、体重指数（BMI）和身体组成的影响。根据初始体重和年龄，将25只杜泊羊、27只卡他丁羊和33只圣克罗伊羊分配到不同组和处理中。补充处理为以体重的0.16%饲喂豆粕（LS），以及以体重的0.8%（干物质基础）饲喂由25%豆粕和75%玉米粉组成的混合物（HS），持续88至102天，包括繁殖后17天。LS组的小麦秸秆摄入量（占体重的百分比）高于HS组（P<0.01）。各品种间的平均日增重和BCS变化相似，但HS组均高于LS组。各品种间的出生率、产仔数、总产仔体重、妊娠期长度和配种次数相似（P>0.05），尽管圣克罗伊羊的个体羔羊出生体重低于卡他丁羊（P<0.05）。这些繁殖变量均不受处理或品种×处理交互作用的影响（P>0.05）。在第0周或第4周，各品种在全身水分、脂肪、蛋白质、灰分或能量浓度方面无差异，但在第8周，圣克罗伊羊的水分、蛋白质和灰分浓度在品种中最高（P<0.05），圣克罗伊羊的脂肪和能量水平低于杜泊羊（P<0.05）。在第8周，HS组的脂肪和能量总量及浓度高于LS组，而水分、蛋白质和灰分的含量则低于LS组（P<0.05）。胆固醇和非酯化脂肪酸的血液浓度在处理和时期之间存在交互作用（P<0.05），甘油三酯水平和总抗氧化能力在品种、处理和时期之间存在交互作用（P<0.05）。HS组的皮质醇浓度高于LS组（P<0.05）。总之，尽管体重和BCS变化存在差异，但补充营养并未影响繁殖性能，这可能是由于初始体况适中以及LS处理的小麦秸秆摄入量较高所致。
