Browsing Artículos Científicos by Subject "REPRODUCCIÓN ANIMAL"
Now showing items 1-14 of 14
-
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Intervalo parto-concepción en ganado lechero especializado de Costa Rica
(Universidad Nacional, Costa Rica, 2019-03-25)Resumen: Un hato lechero eficiente debe producir una cría viva y sana por vaca, por año, y esto se debe de conseguir con un Intervalo Parto Concepción (IPC) no superior a 100 días. Objetivo: describir aspectos epidemiológicos ... -
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 ... -
Monitoring female reproductive function by measurement of fecal estrogen and progesterone metabolites in the white-faced saki (Pithecia pithecia)
(Wiley-Liss, 1994)A simple method for extracting and measuring ovarian steroids in feces is applied to the ovarian cycle, pregnancy, parturition, and period of lacta tional amenorrhea in Pithecia pithecia. Small amounts of wet, unmixed ... -
Morphological features of the seminiferous and cauda Epididymides epithelia of breeding zebu bulls with normal and decreased testicular consistency
(The Society for Reproduction and Development, 1999)The fine morphology of the testes and epididymes collected from breeding Zebu (Bos indicus) bulls with normal or decreased testicular consistency (TC) at clinical palpation was studied. The ultrastructure of testicles with ... -
Proyecto de mejoramiento genético mediante reproducción asistida de rumiantes menores
(Universidad Nacional, Costa Rica, 2016-02-01)El proyecto se desarrolló en la Estación Experimental Finca Santa Lucía, ubicada en el distrito Santa Lucía, Barva, Heredia. El objetivo general fue desarrollar y operar un programa de mejoramiento genético mediante ... -
Relación del estado fisiológico de ovarios de cerdas con la causa del descarte en dos granjas de Costa Rica
(Revista Científica, FCV-LUZ, 2012-03-23)Con el objetivo de determinar la relación de la condición funcio- nal de los ovarios de cerdas con la causa del descarte, se reali- zó un análisis de 260 pares de gónadas de hembras porcinas, provenientes de cerdas de ... -
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, ...