Influence of dietary supplementation of yeast on milk composition and lactation curve behavior of Sohagi ewes, and the growth performance of their newborn lambs

•Milk yield improved by 20.3 % with yeast supplementation at 10 g/ewe/day.•Dry yeast changed the lactation curve profile over the 15-week lactation period.•Increased total protein, albumin, glucose, urea and AST concentrations with yeast addition.•Dietary yeast improved the average daily weight gain of lambs by 18.4 %.