{{cite journal | last1=Bayril | first1=T. | author2=O. Yilmaz | author3=B. Cak | year=2016 | title=EFFECT OF TIMING OF ARTIFICIAL INSEMINATION RELATIVE TO SPONTANEOUS ESTRUS ON REPRODUCTIVE PERFORMANCE AND CALF GENDER RATIO IN REPEAT BREEDER HOLSTEIN COWS | journal=Journal of Animal and Plant Sciences | volume=26 | issue=4 | pages=924-930 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2016-JAPS-123}}