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Changes in Body Weight During the First Pregnancy for Holstein Heifers Calving at Different Seasons¹

University of Nebraska, Lincoln

ABSTRACT

Body weight gains during pregnancy were studied for 100 Holstein heifers calving at different seasons of the year. The year was divided into four seasons as follows: January, February, and March; April, May, and June; July August, and September; and October, November, and December. Body weight gain during gestation was least for that group of heifers calving during the period July, August, and September. Weight gain for the heifers calving during the other three seasons was significantly higher. The weight gain during the last 2 mo. of pregnancy appeared to be positively correlated with subsequent milk yield, regardless of season of calving.