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The impact of overstocking and negative energy balance on quantitative measurement of non-typhoidal Salmonella in periparturient dairy cattle
(Frontiers in Veterinary Science, 2022-02-17)
Stressful conditions in animal production facilities may exacerbate the fecal shedding and
foodborne transmission of non-typhoidal Salmonella enterica subsp. enterica. Dairy cows
are reservoirs of this zoonotic microorganism, ...
Additive genetic and heterosis effects for milk fever in a population of Jersey, Holstein × Jersey, and Holstein cattle under grazing conditions
(FASS Inc. and Elsevier Inc., 2018-10)
The aim of this study was to estimate additive genetic and heterosis effects for milk fever (MF) in Costa Rican dairy cattle. A farm-based management information software was used to collect 223,783 parity records between ...
Assessment of sperm morphology in Zebu bulls, under field conditions in the tropics
(Blackwell, 2001)
Sperm morphology was studied in 302 extensively managed Zebu bulls (aged 1.5-9 years), classified as sound (n = 166) or unsound (n = 136) for breeding, under field conditions in the dry tropics of Costa Rica. Single semen ...
Behavioral characteristics of Bos indicus cattle after a superovulatory treatment compared to cows synchronized for estrus
(Asian-Australasian Association of Animal Production Societies(AAAP), 2011-10)
The intensity and duration of sexual behavior in Bos indicus was assessed through the continuous observation of sexual receptivity. Two groups of cows were formed: only synchronized (n = 50) and other group further ...
Breeding soundness evaluation of extensively managed bulls in Costa Rica
(Elsevier, 1999-02-17)
This paper describes the results of single breeding soundness evaluations (BSE) in 898 Bos indicus, Bos taurus and B. indicus x B. taurus bulls, 1 to 12 yr. old, extensively reared in different climatic regions of Costa ...
Effect of neosporosis on productive and reproductive performance of dairy cattle in Costa Rica
(Elsevier B.V, 2005-12)
A cross-sectional study was conducted to assess the effect of neosporosis on productive and reproductive parameters in dairy cows. Cows (n = 2743) from 94 farms located in the most important dairy areas in Costa Rica were ...
Clinical and pathological findings of a sac-like formation in the tunica vaginalis of a nelore (Bos indicus) bull
(Blackwell, 2010)
Contents A seven-month-old purebred Nelore calf was diagnosed with a bilateral finger-shaped swelling although more prominent at the left side of the scrotum, located longitudinal and parallel to epididymis corpus. The ...
Deferred bulls: are cycles per conception and pregnancy rate determined by the type of spermiogramme deviation under natural mating?
(Elsevier, 2016)
Deferred bulls undergo clinical deviations that could
be transitory or have an uncertain potential fertility output. Data in Costa Rica showed no significant differences
in conception rate (CR) between sound vs. deferred ...
Evaluación de la fertilidad de hembras Bos indicus, de acuerdo a la intensidad del celo, manejadas en un programa de inseminación artificial a tiempo fijo en condiciones de trópico
(Universidad del Zulia, 2009)
El objetivo del presente estudio fue evaluar la fertilidad obteni da en un hato, según dos tiempos de Inseminación Artificial
(IA) a tiempo fijo: 48 y 72 horas, posterior a un programa de
sincronización de celos, tomando ...
Management factors related to calf morbidity and mortality rates
(Elsevier B.V, 1990)
An observational epidemiological study was carried out on 63 commercial Dutch dairy farms. The relationship between managerial procedures and morbidity and mortality patterns in 1037 dairy calves from birth to 4 months of ...