TIME
NORMAL ESTROUS CYCLE FOR BEEF CATTLE 21
DA Y
ESTROGE
Over the first 10 days of the estrous cycle, the follicle develops into corpus luteum and begins to produce progesterone.
SIGNS TO LOOK FOR DURING HEAT PERIOD HEAT PERIOD
N INCREA SING
G NIN GIN
OD
Breeding Tips to Achieve Maximum SexedULTRA 4M® Conception Rates
BE
RI
N
PE
O
AT
TI LA
HE
SE HA
U OV
DAY 19-20
DAY 1-11
0
P AL TE LU
Y DA
EARLY COMING INTO HEAT
DING
N ASE E
L PH LUTEA
11-
12
MIDDLE STANDING HEAT
GENITALIA
DISCHARGE
TAILHEAD/RUMP
Lips of vulva slightly swollen
Very little, watery
Little changes
Stands to be mounted and mounts others No appetite, restless
Lips of vulva swollen and shiny
Abundant, clear mucus
Tailhead hair ruffled
Will not stand to be mounted, - Disapearing signs of restlessness
Swelling decreased
Decreased discharge, thick, rubbery consistency
Tailhead and rump hair matted down and possibly rubbed off
Bawling, fence walking, agressive, head-butting
ACCEPTABLE BREEDING TIME: 16 -24 HRS
Y
AY
18
Corpus luteum reaches maximum size and progesterone is at highest level
BEHAVIOR Mounts other cows
A
D
D
LATE COMING OUT OF HEAT
IDEAL BREEDING TIME: 18-22 HRS
ONSET OF STANDING HEAT
PREFERRED TIMES TO BREED WITH
10
4 P.M. 12 A.M. 1 A.M. 2 A.M. 3 A.M. 4 A.M. 5 A.M. 6 A.M. 7 A.M. 8 A.M. 9 A.M. 10 A.M. 11 A.M. 12 P.M. 1 P.M. 2 P.M. 3 P.M. 4 P.M. 5 P.M. 6 P.M. 7 P.M. 8 P.M. 9 P.M. 10 P.M. 11 P.M.
5 P.M.
6 P.M.
7 P.M.
8 P.M.
9 P.M.
10 P.M.
11 P.M.
12 A.M.
1 A.M.
2 A.M.
3 A.M.
4 A.M.
5 A.M.
6 A.M.
7 A.M.
8 A.M.
9 A.M.
10 A.M.
11 A.M.
12 P.M.
1 P.M.
2 P.M.
3 P.M.
4 P.M.
5 P.M.
6 P.M.
7 P.M.
8 P.M.
9 P.M.
10 P.M.
11 P.M.
