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Abstract

In October, 1944, the office of Zootechny was absorbed into the newly formed Directorate of Cattle Breeding, Game and Fisheries. The Directorate instructs farmers in milk recording and collects and publishes records of the volume and fat content of milk and enters proven sires of pure breed in a...

Author(s)
Barrios, S. A.
Publisher
Guatemala,
Citation
Revue Agricole, 1945, 1, pp 318-332
Abstract

1746 calving records of Tropical Dairy Criollo (TDC) cows and their crosses were collected between 1972 and 1990 at the experiment station of the Mexican Association of Animal Production on the Gulf Coast of Mexico. Traits studied were 305-day milk yield, days in lactation, number of services per...

Author(s)
Alba, J. de; Kennedy, B. W.
Citation
Animal Production, 1994, 58, 2, pp 159-165
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

The aim of this study was to estimate genetic and phenotypic (co)variances for lactation curve traits and for days open in Holstein cows. Data included 1 579 lactations from 766 cows, daughters of 126 sires in a dairy herd in northern Mexico. The studied traits within lactation were days open (DO), ...

Author(s)
López-Ordaz, R.; Castillo-Juárez, H.; Montaldo, H. H.
Publisher
Veterinaria Mexico, Revista de la Facultad de Medicina Veterinaria y Zootecnia, Coyoacan, Mexico
Citation
Veterinaria México, 2009, 40, 4, pp 343-356
Abstract

The allelic variants of FSH-Receptor (FSHR) gene in cows of different genotypes was determined. Forty-five cows were allotted in groups according to genotype: Bos taurus (n=15), Bos indicus (n=15) and Bos taurus × Bos indicus (crossbred; n=15). The hardy-weinberg equilibrium was determined in the...

Author(s)
Hernandez-Cruz, B. C.; Cervantes-Acosta, P.; Montiel-Palacios, F.; Canseco-Sedano, R.; Carrasco-García, A.
Publisher
Medwell Online, Faisalabad, Pakistan
Citation
Journal of Animal and Veterinary Advances, 2009, 8, 12, pp 2489-2494
Abstract

The ancestry of New World cattle was investigated through the analysis of mitochondrial and Y chromosome variation in Creoles from Argentina, Brazil, Mexico, Paraguay and the United States of America. Breeds that influenced the Creoles, such as Iberian native, British and Zebu, were also studied....

Author(s)
Ginja, C.; Penedo, M. C. T.; Melucci, L.; Quiroz, J.; Martínez López, O. R.; Revidatti, M. A.; Martínez-Martínez, A.; Delgado, J. V.; Gama, L. T.
Publisher
Blackwell Publishing Ltd, Oxford, UK
Citation
Animal Genetics, 2010, 41, 2, pp 128-141
Abstract

The objective of this study was to determine if the technique of embryo transfer in cattle can be commercially feasible in a region situated in the humid tropics of Mexico. Twenty-six Bos taurus and twenty-six Bos indicus cows were estrous synchronized and superovulated to obtain a total of 80...

Author(s)
Alarcón, M. A.; Galina, C. S.; Corro, M. D.; Asprón, M. A.
Publisher
Springer, Amsterdam, The Netherlands
Citation
Tropical Animal Health and Production, 2010, 42, 6, pp 1135-1141
Abstract

Breeding records, including 649 inseminations during fall and winter at a dairy farm in a subtropical area of Western Mexico (24°N; 24°C, mean annual temperature 24°C) were analyzed to document effects of sex-sorted semen from commercial Gyr bulls, estrus synchronization protocol, inseminator, sire ...

Author(s)
Mellado, M.; Coronel, F.; Estrada, A.; Ríos, F. G.
Publisher
Springer, Amsterdam, The Netherlands
Citation
Tropical Animal Health and Production, 2010, 42, 7, pp 1493-1496
Abstract

The effect of age at first calving (AFC) and breed type (BG) on cow length of productive life in the herd (LPL) and cumulative kilograms of calves weaned per cow (KWC) was studied. Data on 313 Brahman, 183 Nellore, and 269 crossbred cows (undefined crosses of European × Zebu cattle) born from 1986...

Author(s)
Aranda-Avila, I.; Magaña-Monforte, J. G.; Segura-Correa, J. C.
Publisher
Springer, Amsterdam, Netherlands
Citation
Tropical Animal Health and Production, 2010, 42, 8, pp 1737-1741
Abstract

The aim of this study was determined the effect of suckling of the calf restricted to once a day per 30 min plus a combined hormonal treatment on the postpartum anestrous period and fertility in beef cows after 120 days postpartum. About 67 Bos taurus × Bos indicus crossbred multiparous pregnant...

Author(s)
Escobedo-Amezcua, F.; Herrera-Camacho, J.; Nuncio-Ochoa, M. G. J.; Segura-Correa, J. C.; Gallegos-Sanchez, J.; Marin-Aguilar, M. A.
Publisher
Medwell Online, Faisalabad, Pakistan
Citation
Journal of Animal and Veterinary Advances, 2011, 10, 2, pp 195-199

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