Estrus Synch Considerations

Question 1

Where did bos Taurus cattle originate from

Answer 1

Taurus mountains, Turkey

Question 2

Where did bos indicus cattle originate from

Answer 2

Indicus valley, India

Question 3

Average puberty age of bos indicus heifers in the tropics

Answer 3

16-40 months of age (very late)

Question 4

Average puberty age of bos indicus influenced heifers in US

Answer 4

later than bos taurus, but early enough so that management to calve at two years of age is possible

Question 5

Bos indicus influenced heifers are likely to have _ rates of anestrus at the start of the breeding season

Answer 5

Higher

Question 6

Potential causes of bos indicus anestrus

Answer 6

Longer average gestation length, long term effect of retaining later maturing, ;later concieving heifers, Increased seasonality, greater suppression of reproductive function by environment

Question 7

Ovarian follicular development in bos indicus

Answer 7

Release less LH in response to GnRH or estradiol,

Question 8

GnRh products on bos indicus

Answer 8

Unclear whether GnRh products are as effective for synchronizing ovarian follicular development

Question 9

Bos indicus appears to be _ to progesterone

Answer 9

More sensitive

Question 10

Bos indicus and stress

Answer 10

More susceptibility to stressors. more handling can reduce reproductive technology success

Question 11

_ has a suppressive effect on LH pulsatility

Answer 11

Cortisol

Question 12

Acclimating heifers to human handling can do what

Answer 12

Improve temperament, reduce cortisol, and hasten puberty

Question 13

Temperament is _ heritable

Answer 13

highly (h2=0.4)

Question 14

Is detecting estrus difficult in boss indicus influenced cattle?

Answer 14

Yes, shorter standing length of estrus

Question 15

Estrus synchronization protocol for bos indicus

Answer 15

bee synch- PG 5-d +CIDR

Question 16

14 d CIDR-PG offers consistent results in groups of heifers with mixed cyclicity status