Fertility in Gyr Cows (Bos indicus) with Fixed Time Artificial Insemination and Visual Estrus Detection Using a Classification Table

Table 1

Sexual behavioral signs of cows in estrus.

Item	Main and secondary estrus signs	Score
1	Quiet acceptance (standing) to be mounted by teaser bull or cow (QAM)	100
2	Standing to disoriented mounts	60
3	Chin resting of bull or cow on rump	50
4	Alopecia by scraping or excoriation on tail head or rump	30
5	Vulva mucosa red or pink	20/5
6	Presence or discharge of cervical mucus	30
7	Supporting chin on rump of other cows	10
8	Frequent urination (more than three times)	10
9	Sniffing and licking the anogenital zone by another cow	10
10	Flehmen by bull or cow	10
11	Walking in circles with mutual sniffing of the genitalia	10
12	Butting head to head	5
13	Attempt or rejection to mount	5
14	To be followed by other cows (following)	5
15	Walking, agitated, or nervous (restlessness)	5
16	Accepting chin or head support else where	5
Score ≥ 100 points needed to classify a cow in estrus in an observation period AM or PM