Patterns of milk production, blood metabolite profile and enzyme activities of two fat-tailed sheep breeds

摘要: This study was conducted to compare milk yield and composition, blood parameters enzyme activities between two fat-tailed Iranian breeds of sheep (Mehraban Sanjabi). Two groups eight ewes per breed were kept indoors fed a diet based on alfalfa hay (60%) concentrates (40%). Milk production the individual measured sampled weekly for 11 weeks samples obtained at 28, 56 77 days lactation. No significant differences evident in average daily fat lactose contents, but protein content tended be higher (P = 0.05) Mehraban than Sanjabi ewes. However, yields < last two-thirds Plasma lipid profile (triglyceride, cholesterol, HDL- LDL-cholesterol) not different any time study. At end lactation, plasma urea contents alanine amino transferase either before or after feeding ewes, which suggests more intense metabolic activity former probably related their that stage