Results 301 to 310 of about 64,651 (320)
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Time of onset of estrus in gilts
Theriogenology, 1986An experiment was conducted to determine when, during a 24-h period, gilts show the onset of behavioral estrus. Beginning on Day 16 of their first estrous cycle, 42 crossbred gilts were observed at 0600, 1200, 1800, and 2400 h for the onset of their second estrus. Fifty-five percent of the gilts had shown onset of estrus by 0600 h.
L. F. Tribble +3 more
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Induction of estrus by electrical stimulation
American Journal of Physiology-Legacy Content, 1959Using the apparatus designed for the electroejaculation of bulls, the reproductive organs of anestrous cows were electrically stimulated through the rectal wall. Forty-three per cent of the cows which had been in anestrus for 50 or more days after calving came in heat within 7 days after an electrical stimulation as compared to 13% of the controls ...
C. H. Carlevaro, R. L. Hays
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Theriogenology, 1999
The effects on estrus and fertility of 3 estrus synchronization protocols were studied in Brahman beef heifers. In Treatment 1 (PGF protocol; n=234), heifers received 7.5 mg, i.m. prostianol on Day 0 and were inseminated after observed estrus until Day 5. Treatment 2 (10-d NOR protocol; n = 220) consisted of norgestomet (NOR; 3 mg, s.c.
Corbet, N. J. +8 more
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The effects on estrus and fertility of 3 estrus synchronization protocols were studied in Brahman beef heifers. In Treatment 1 (PGF protocol; n=234), heifers received 7.5 mg, i.m. prostianol on Day 0 and were inseminated after observed estrus until Day 5. Treatment 2 (10-d NOR protocol; n = 220) consisted of norgestomet (NOR; 3 mg, s.c.
Corbet, N. J. +8 more
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Seasonal effects on behavioral estrus signs and estrus detection efficiency in Holstein heifers
Indian Journal of Animal Research, 2016In the study, 234 Holstein heifers were observed visually during a one-year period and 1622 estrus records were used to determine seasonal effects on behavioral estrus signs and estrus detection efficiency. Estrus records were classified as standing, mounting, vaginal mucus discharging, and the other estrus signs.
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Estrus characterization in superovulated cattle
Theriogenology, 1993Abstract Based on frequent examinations per rectum and on external signs of estrus, the intensity of estrus was characterized in 107 superovulated dairy cows and heifers. Three intensity groups were defined: strong (n=57), moderate (n=34), and weak (n=16). Frequent blood samples were obtained for analyses of estradiol-17β and LH.
Callesen, Henrik +2 more
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Journal of Animal Science, 1996
The effectiveness of two estrus-detection methods (visual observation and radiotelemetric, pressure-sensitive, rump-mounted devices) was compared in peripubertal, crossbred yearling beef heifers. Heifers (n = 50) were fitted with a pressure-sensitive device affixed to their rumps to which a battery-operated radio transmitter was connected.
D. G. LeFever +4 more
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The effectiveness of two estrus-detection methods (visual observation and radiotelemetric, pressure-sensitive, rump-mounted devices) was compared in peripubertal, crossbred yearling beef heifers. Heifers (n = 50) were fitted with a pressure-sensitive device affixed to their rumps to which a battery-operated radio transmitter was connected.
D. G. LeFever +4 more
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Induction and synchronization of estrus in dogs
Theriogenology, 2005Indications for estrus induction in the bitch include missed breeding opportunities or conception failure, the treatment of primary or secondary anestrus and synchronization of ovulation for embryo transfer programs. Reported methods for canine estrus induction include the use of synthetic estrogens (diethylstilbesterol), dopamine agonists ...
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Estrus Suppression in Performance Horses
Journal of Equine Veterinary Science, 2003E xpression of behavioral estrus, or heat, in mares can have a profound negative effect on training and performance. Mares begin to exhibit sporadic periods of estrus in February or March, with the onset of follicular development during the spring transition period. Estrus is normally expressed for 5 to 7 days out of the 21-day estrous cycle during the
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Estrus Synchronization: Cattle [PDF]
, 2004 Duane L. Davis, Jeffrey S. Stevenson
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