Maternal Metabolic Demands Caused by Pregnancy and Lactation: Association with Productivity and Offspring Phenotype in High-Yielding Dairy Ewes.

摘要: Pregnancy and lactation, especially when concurrent, create a rather metabolically demanding situation in dairy ruminants, but little is known about their effects on offspring phenotype milk yield. Here, we evaluated the impact of pregnancy lactation metabolic traits productive performance Lacaune sheep offspring. Productive was measured terms yield, body weight (BW), condition score (BCS), size. Productivity assessed during mid-pregnancy (75 ± 5 d) late (142 4 at 52 d postpartum period. During pregnancy, high-yielding ewes had higher BW, BCS, plasma glucose, cholesterol, β-OHB, NEFA than low-yielding ewes, lower levels lactate urea. High-yielding animals BCS after lambing, lambs showed greater growth. affected by ewe age parity: Mature (but not maiden sheep) whose increased steeply yielded more subsequent those did increase. Lamb BW size were positively associated with yield lactation. yields sheep, mature multiple pregnancies produced singleton pregnancies. Ewes male also female singletons. These results demonstrate that appropriately fed managed, can adequately cover demands high production (even concurrent) without losing productivity.