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Animal Science Database

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Abstract

The objectives were to evaluate the effect of synchronization protocols on follicular development and estradiol 17-β (E2) and progesterone (P4) concentrations in dairy heifers. In experiment 1, 36 heifers were assigned to 1 of 6 synchronization protocols in a 3×2 factorial design:...

Author(s)
Stevenson, J. L.; Dalton, J. C.; Santos, J. E. P.; Sartori, R.; Ahmadzadeh, A.; Chebel, R. C.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 8, pp 3045-3056
Abstract

The objective was to compare pregnancy rates in nulliparous Holstein heifers given PGF 24 h before, or concurrent with, removal of an intravaginal progesterone-releasing (CIDR) insert in 3 timed artificial insemination (TAI) protocols. Heifers (from 2 herds) were assigned randomly, over 11 mo, to ...

Author(s)
Ambrose, D. J.; Emmanuel, D. G. V.; Colazo, M. G.; Kastelic, J. P.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 7, pp 2678-2683
Abstract

The objective of this experiment was to study the total cholesterol and high-density lipoprotein (HDL) levels in crossbred heifers treated with bovine recombinant somatotropin (rbST). Blood samples were collected during normal and superovulated oestrous cycle of 26 heifers randomly distributed into ...

Author(s)
Borges, Á. M.; Torres, C. A. A.; Ruas, J. R. M.; Carvalho, G. R.; Rocha Júnior, V. R.
Publisher
Escola de Veterinária, Universidad Federal de Minas Gerais, Belo Horizonte, Brazil
Citation
Arquivo Brasileiro de Medicina Veterinária e Zootecnia, 2001, 53, 5, pp 605-610
Abstract

In the 1st of 2 experiments, 208 crossbred yearling heifers were synchronized in oestrus with Syncro-Mate-B, artificially inseminated 48-54 h after implant removal (day 1) and fed MGA from day 17 to day 21 (0.5 mg/head daily) or not treated (controls). Oestrus synchrony was defined as the 3-day...

Author(s)
Purvis, H. T., II; Whittier, J. C.
Citation
Theriogenology, 1997, 48, 3, pp 423-434
Abstract

11 Swedish Red-and-White and Swedish Friesian heifers with normal oestrous cycles were monitored for signs of oestrus; the growth of the ovulatory follicle and ovulation were determined by frequent ultrasonic scanning and artificial insemination was carried out 12 h after the detection of standing...

Author(s)
Duchens, M.; Forsberg, M.; Gustafsson, H.; Edqvist, L.; Rodríguez-Martínez, H.
Citation
Animal Reproduction Science, 1995, 39, 3, pp 171-182
Abstract

Blood samples were taken from 48 heifers three times a day during a week before and 20 days after AI. Blood progesterone and LH remained constant for up to 16 days after insemination, whether the heifer was pregnant or not, but between 17 and 20 days the progesterone decreased in non-pregnant...

Author(s)
Roche, J. F.; Ireland, J. J.; Boland, M. P.; McGeady, T. M.
Citation
Veterinary Record, 1985, 116, 6, pp 153-155
Abstract

Samples of jugular vein blood were obtained from 5 bulls during (1) mating of oestrous cows with intromission and ejaculation, (2) mounting a dummy or another bull plus ejaculation into an artificial vagina, or (3) false mounts; the oxytocin content was measured by radioimmunoassay (limit of...

Author(s)
Schams, D.; Baumann, G.; Leidl, W.
Citation
Acta Endocrinologica, 1982, 99, 2, pp 218-223
Abstract

Endoscopy was carried out on 9 Holstein Friesian cows and heifers every 2 days for 30-50 days. Also, LH, FSH and progesterone levels were measured in jugular blood samples taken every 6 h, and oestrogen levels were measured in daily urine samples. LH levels were low during the oestrous cycle until...

Author(s)
Schams, D.; Toth, G.; Schallenberger, E.; Hoffmann, B.; Karg, H.
Citation
VIIIth International Congress on Animal Reproduction and Artificial Insemination, Krakow, July 12-16, 1976. Proceedings. Volume I. Communication Abstracts., 1976, pp 229
Abstract

DUBROVINA, G. A. [Meat production in crossbred sheep of different ages at high environmental temperatures]: 76-80.
ERMOLENKO, E. K. [Comparison of growth changes on adrenal glands in boars and castrates]: 81-85.
IL'INSKII, E. V., and SAL'NIKOV, G. S. [Reproductive function of bulls with different...

Author(s)
A. P. Kostin; P. I. Viktorov; E. V. ll'inskii; Ya. I. Polyanichko; P. M. Mikhailyuk
Publisher
Krasnodar: Sovetskaya Kuban,
Citation
Ispol'zovanie biologicheskikh zakono-memostel v povyshenii produktivnosti sel'skokhozyal-stvennykh zhivotnykh. (Materialy k Konferentsii Zootekhnicheskogo Fakul'teta.), 1971, pp 408 pp.
Abstract

Semen from 16 experimentally infected bulls was examined. F & M disease virus appeared in semen of 2 bulls as early as 12 hours after inoculation and thereafter virus was found in 58 of 71 semen samples from 16 bulls for as long as 10 days. The highest titre in semen was 105.8 mouse LD50/ml and the ...

Author(s)
Cottral, G. E.; Gailiunas, P.; Cox, B. F.
Citation
Archiv fur die gesamte Virusforschung, 1968, 23, pp 362-377

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