Zootecniahttps://hdl.handle.net/10669/2702024-03-19T06:58:07Z2024-03-19T06:58:07ZImportancia del calostro en la crianza de ternerashttps://hdl.handle.net/10669/910912024-03-15T14:14:41Z2007-01-01T00:00:00ZImportancia del calostro en la crianza de terneras
El calostro es la primera secreción
producida por la glándula mamaria
después del parto. Es especialmente
rico en anticuerpos, los cuales proveen
a la ternera su protección inmunológica
durante las primeras semanas de vida.
El calostro contiene un gran número
de linfocitos, neutrófi los, macrófagos,
factores de crecimiento y hormonas como la insulina y el cortisol.
2007-01-01T00:00:00ZEl uso del semen sexado en ganado de leche ¿Se puede incrementar el nacimiento de terneras?https://hdl.handle.net/10669/910902024-03-15T14:14:30Z2007-01-01T00:00:00ZEl uso del semen sexado en ganado de leche ¿Se puede incrementar el nacimiento de terneras?
Desde que la IA se empezó a utilizar en forma
generalizada, ha existido un gran interés en
el sexado del semen para obtener solo
hembras, ya que esta técnica incrementa la
posibilidad de lograr una ternera en lugar de
un ternero, que es el sueño de todo finquero
criador de ganado de leche principalmente,
en el ámbito mundial.
2007-01-01T00:00:00ZInvestigating the gastrointestinal physiology of mature horses with and without a history of cribbing behavior in response to feeding a digestive support supplementhttps://hdl.handle.net/10669/910742024-03-12T18:37:39Z2024-01-01T00:00:00ZInvestigating the gastrointestinal physiology of mature horses with and without a history of cribbing behavior in response to feeding a digestive support supplement
Cribbing, a stereotypic oral behavior observed in horses, involves placing incisors on a fixed object, arching the neck, pulling against the object, and emitting an audible grunt. This behavior has been associated with gastrointestinal (GI) dysfunction and gastric ulceration. In this randomized crossover study, we investigated the impact of a GI support supplement (SPL) on the GI environment and physiology of four cribbing (CB) and four non-cribbing horses (NCB). Mature Quarter Horses, acclimated to individual stalls for 16 hours daily with paddock turnout in pairs for 8 hours per day, were randomly assigned to receive either the SPL or placebo for 21 days, followed by a 2-week washout period. Fecal and gastric samples were collected for pH determination, and blood samples were analyzed for serum cortisol and gastrin levels. Endoscopic examinations assessed gastric ulcer severity, and cribbing frequency and bouts were recorded via video surveillance. Data were analyzed using a mixed-model ANOVA. Results showed no differences in fecal and gastric pH between cribbing statuses. However, an interaction between supplementation and cribbing status was observed for squamous mucosa ulcer scores (P = 0.003). There were no differences in glandular mucosa ulcer scores, serum cortisol, serum gastrin, and crib-bite count between CB and NCB horses or between supplementation groups. Crib-bout duration did not differ with supplementation, but differences were found between periods (P < 0.05) and hour ranges (P < 0.001). Our findings suggest that the GI support supplement may not effectively address cribbing behavior or alter the GI environment in NCB or CB horses.
2024-01-01T00:00:00ZFeeding behavior and preference of horses fed rhizome peanut hayhttps://hdl.handle.net/10669/910732024-03-12T18:27:35Z2021-01-01T00:00:00ZFeeding behavior and preference of horses fed rhizome peanut hay
Rhizoma peanut (RP, Arachis glabrata Benth) has been used as alternative legume hay for horses; however, feeding behavior and preference of horses fed this hay in comparison to other commonly fed hays war- rant investigation. This study aimed to evaluate the feeding behavior and preference of mature horses with maintenance requirements fed RP “Florigraze”hay compared with alfalfa (ALF, Medicago sativa L. “Legendary XHD”) and bermudagrass (BMG, Cynodon dactylon L. “coastal”) hays. Six mature Quarter Horse geldings (593 ±40 kg; mean ±SD) were used in a replicated 3 ×3 Latin square with 21-day pe- riods. Horses were individually housed in 5 ×4 m stalls bedded with wood shavings. Hays were offered to horses in 46 ×36 cm 66-L rubber-polyethylene containers. Hays were analyzed for chemical composi- tion before the start of the study. After a 14-day diet adaptation, 24-hour behavioral observations were conducted using scan sampling. Time spent feeding, inactive, and at other activities were recorded every 10 minutes. Three-choice preference tests were conducted for a 2-hour duration twice daily on day 20 and 21 by simultaneously presenting 1 kg (as-fed basis) of all 3 hays. Horses’ first choice, hay consump- tion, and number of times each hay was smelled or tasted but left in preference for another hay were recorded. Preference data were analyzed using descriptive statistics, while behavioral data and hay con- sumption were analyzed using repeated measures mixed model ANOVA. A hay x time-of-day effect was observed on feeding time ( P = 0.0408), and ALF resulted in reduced feeding time 2-4 hours after meals were offered compared to RP and BMG. Daily feeding time was shorter ( P < 0.0 0 01) with ALF than BMG (11.7 vs. 8.9 h/d), but RP (9.9 h/d) did not differ from BMG or ALF. Total daily inactivity time was greatest for ALF ( P = 0.0037) and similar between BMG and RP. Hay consumption was greatest ( P < 0.0 0 01) for ALF (0.996 ±0.015 kg as-fed/test; mean ±SE), followed by RP (0.935 kg), and least with BMG (0.792 kg). Horses show preference for legumes over grass hay, which might be associated with the higher protein and energy and lower fiber concentration of the hays. Rhizoma peanut has the potential to provide im- proved welfare by providing decreased inactivity time compared to ALF, while being preferred over BMG. These attributes make RP a suitable forage source for horses.
2021-01-01T00:00:00Z