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Resumption of postpartum luteal function of primiparous, suckled beef cows exposed continuously to bull urine^1,2

S. A. Tauck^*, J. G. Berardinelli^*,3, T. W. Geary and N. J. Johnson^*

^* Montana State University, Bozeman 59717; and USDA-ARS Fort Keogh Livestock and Range Research Laboratory, Miles City, MT 59301

³ Corresponding author: jgb{at}montana.edu

The objective of this experiment was to determine if continuous exposure to bull urine alters resumption of ovarian cycling activity of primiparous, suckled beef cows. We tested the hypotheses that interval from urine exposure to resumption of luteal activity and proportions of cows that resume luteal activity by the end of the urine-exposure period do not differ between cows exposed to mature bull urine or steer urine. Thirty-eight Angus (A) x Hereford (H) cows, 4 mature A x H bulls and four 10-mo-old A x H steers, were used in this study. Cows were stratified by calving date, cow BW, calf BW, calf sex, dystocia score, and BCS; fitted with a controlled urine delivery device 2 wk before the start of treatments; and assigned randomly to be exposed continuously (24 h/d) to bull urine (n = 19) or steer urine (n = 19) beginning 40 d after calving. Urine was collected from bulls and steers every third day of the experiment. Blood samples were collected from cows starting on d 0 and every third day thereafter until the end of the exposure period (~64 d). Likewise, controlled urine delivery devices were filled and refilled on the same schedule. Neither interval from urine exposure to resumption of luteal activity nor proportions of cows that resumed luteal activity during the urine-exposure period differed between cows exposed to bull urine or steer urine. We concluded that continuous exposure to mature bull urine does not affect resumption of luteal activity of primiparous, suckled beef cows.

Key Words: biostimulation • bovine • bull urine • pheromone • postpartum interval

This article has been cited by other articles:

				S. A. Tauck and J. G. Berardinelli Putative urinary pheromone of bulls involved with breeding performance of primiparous beef cows in a progestin-based estrous synchronization protocol J Anim Sci, July 1, 2007; 85(7): 1669 - 1674. [Abstract] [Full Text] [PDF]