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Abstract

Author(s)
Gonzalez, C. G.; Ramos Gomez, A.
Citation
Proceedings of the 20th World Veterinary Congress, Thessaloniki, 1975, 3, pp 2541-2546
Abstract

Postpartum ovarian activity was evaluated once per week for 3 months in a herd of Holstein cows in Mexico. The presence of a corpus luteum was correctly diagnosed in 37.5, 56.63 and 59.4% respectively of cows palpated <70, 71-110 and 111-150 days after calving, and the absence of a corpus luteum ...

Author(s)
Silva, E.; Galina, C. S.; Porras, A. A.; Galina, M. A.
Citation
Ciencias Veterinarias (Heredia), 1992, 14, 1, pp 5-11
Abstract

20 F1 Sahiwal-Holstein cows were selected according to body condition, health status and milk yield. Animals were divided into 2 groups of 10 cows each. Group 1 was injected s.c. with 250 mg of somatotropin (GH) every 14 days, and Group 2 did not receive any treatment. All cows grazed and were...

Author(s)
Ocampo, L. C.; Morales, M.; Basurto, H. C.; Auró, A. A.
Citation
Veterinaria México, 1995, 26, 2, pp 137-139
Abstract

Genetic parameters for udder conformation traits (front udder insertion, median suspensory ligament, udder depth and texture and front teat placement) and final score were estimated for registered Holstein cattle using 4780 classifications performed in Mexico from 1994 to 1995. Different...

Author(s)
Pérez Navarrete, I.; Ruíz López, F. de J.
Citation
Técnica Pecuaria en México, 1998, 36, 1, pp 25-34
Abstract

In 1996 in Mexico State (Mexico), 120 cycling cows were equally divided among 3 pens. Nine cows were induced to display oestrus with norgestomet implants, oestradiol valerate and GnRH on each of the first 3 days of the experiment. On the 1st day, 1 cow in pen 1, 5 in pen 2, and 3 in pen 3 displayed ...

Author(s)
López, L.; Galina, C. S.; Orihuela, A.
Citation
Tropical Agriculture, 1998, 75, 3, pp 405-408
Abstract

24 heifers were treated with 25 mg of PGF2α intramuscularly. Eleven days later, 12 of these heifers (group 1) were fitted with a controlled internal drug-releasing device (CIDR; with corpus luteum) filled with progesterone. The rest of the heifers (n=12) were fitted with a progesterone-filled CIDR...

Author(s)
Lugo León, S.; Hernández Cerón, J.; López León, L.
Citation
Veterinaria México, 1999, 30, 1, pp 95-98
Abstract

The dynamics of vaginal cell exfoliation in the breeding season in goats (Criollo × dairy breeds; housed at the Center for Teaching and Research of the Faculty of Veterinary Medicine of the National University of Mexico) and its relationship with oestrogen levels and sexual behavior in the...

Author(s)
Pérez-Martínez, M.; Mendoza, M. E.; Romano, M. C.
Citation
Small Ruminant Research, 1999, 33, 2, pp 153-158
Abstract

Nine Brahman and 6 Nelore bulls were examined for libido and serving capacity, semen characteristics and scrotal circumference, a week before being placed, individually, into a group of 16 oestrus-synchronized heifers to observe mating activity. Scores for libido (0-10) and for serving capacity...

Author(s)
Silva-Mena, C.; Aké-López, R.; Delgado-León, R.
Citation
Theriogenology, 2000, 53, 4, pp 991-1002
Abstract

Data on test day (TD) milk yield of cows from a dual-purpose herd were analysed by a mixed linear model in order to: choose the appropriate phenotypic (co)variance matrix structure, analyse the existence of trends in variances and covariances over time, and obtain lactation curves for Bos taurus × ...

Author(s)
Segura, J. C.; Osorio, M. M.
Publisher
CIPAV Foundation, Cali, Colombia
Citation
Livestock Research for Rural Development, 2002, 14, 1, pp 1-7
Abstract

Sexual development and pubertal traits were studied in Holstein Friesian (Ho) and Brown Swiss (BS) bulls born and maintained under tropical conditions. Characteristics evaluated every 2 weeks, from 27 to 63 weeks of age, included live weight, scrotal circumference, testicular diameter, semen...

Author(s)
Jiménez-Severiano, H.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2002, 58, 5, pp 921-932

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