Abstract
DURING investigations into the possibility of artificial insemination of indigenous Zebu and Nganda cattle with homologous semen obtained by electrical stimulation, the œstrous cycles of an experimental group of heifers have been determined, using marked vasectomized bulls. The animals have been examined for evidence of service at 0700 and 1900 hr. local time. In two months, œstrus has been detected in five animals on fifteen occasions; but marking by the bull has never occurred on less than two occasions. These were recorded as of 12 hours duration (0700–1900 hr., and vice versa). Based on this marking of the females, three heat periods lasted 12 hr., nine lasted 24 hr., two lasted 36 hr. and one lasted 48 hr. Of this total, six (40 per cent) were first recorded at 0700 hr. (commenced during darkness), and nine were first recorded at 1900 hr. (commenced during daylight).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
