Bull-bull mounts in Holstein bulls: a survey of its incidence, possible causes, and consequences in Uruguayan bull' breeders.

Animal Reproduction
Stefanie Fajardo, Rodolfo Ungerfeld

Abstract

Bulls frequently display male-male mounts, with consequences in the incidence of injuries, and possibly affecting the reproductive performance of the bulls. This behavior is known as the "buller syndrome" when appears in steers, with several individuals mounting one or a few penmates. The study aimed to collect information on the incidence of bull-bull mounts, the possible associated factors, the productive consequences, and management applied by distributing a survey to Holstein bull breeders in Uruguay. A survey was applied and responded by most Holstein breeders in Uruguay (30/33). Nineteen of the 30 breeders observed mounting behavior among bulls, and 15 of them considered it as a relevant problem. The breeders that observed the behavior had a greater number of bulls than those that did not observe it (P = 0.002). All of them observed that mounts were persistently directed towards the same individual (considering a specific period, while it remained in the group). Of these, 11 (58%) considered that this stopped only when the "buller" bull was removed from the group, mentioning that the behavior was frequently redirected to another individual. The mounts between bulls are a major problem in the breeding of Holstein bulls, wi...Continue Reading

References

Oct 27, 2006·Animal Reproduction Science·R UngerfeldA Bielli
Feb 9, 2008·Animal Reproduction Science·R Ungerfeld, S P González-Pensado
Dec 4, 2014·Tropical Animal Health and Production·Julia GiriboniRodolfo Ungerfeld
Oct 16, 2015·Animal Health Research Reviews·Cassandra B TuckerKaren S Schwartzkopf-Genswein
Feb 7, 2018·Theriogenology·Fernando Sánchez-DávilaRodolfo Ungerfeld

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