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1رسالة جامعية
المؤلفون: Navedo-Guzmán, Ninochka
المساهمون: Ortiz-Colón, Guillermo, College of Agricultural Sciences, Sánchez-Rodríguez, Héctor L., Jiménez-Cabán, Esbal, Curbelo Rodríguez, Jaime E., Department of Animal Science, Plaza-Delestre, María de L.
مصطلحات موضوعية: Alimentación Intensiva, Crecimiento, Salud, Becerras, Calves -- Feeding and feeds, Calves -- Nutrition, Calves -- Growth, Holstein-Friesian cattle, Jersey cattle
الوصف: The objective of this research was to assess the growth and health of Holstein and Jersey calves under an intensive feeding protocol (INT) and a traditional feeding protocol (TRA) under tropical conditions. Calves were divided into blocks based on their breed and gender (n=31). Each animal was in the feeding trial for 7 weeks. Both groups of calves were offered were fed pasteurized waste milk at 0600 and 1700 h daily for seven weeks. The TRA group was offered 3.78 L of milk per day for seven weeks. The amount of milk offered to the INT group was 3.78, 4.74, 5.68, 6.62 and 7.56 L/d from week one to week five, respectively. Afterwards the milk offered to the INT group was reduced to 5.68 and 3.32 L in weeks six and seven, respectively. Both groups were fed the same amount of calf starter (18% crude protein and 2.5% fat). The amount of calf starter offered daily was progressively increased from 0.23 to 0.91 kg from week 1 through 7. Morphometric measures (hip height, cross height, hip width and body length), weight, and health assessment were taken weekly. The data was analyzed with a Prox GLIMMIX with SAS. The feeding protocols did not influenced any of the evaluated parameters for Holstein (P=0.6803), Jersey (P=0.6803), male (P=0.9642) or female (P=0.9642) calves. In the weight parameter, at week 7, the female Holstein calves weighed 55.83 ± 5.00 and 54.19 ± 3.23 kg for the INT and TRA group respectively (P = 1.00). Similarly, both protocols had no effect on the health status of Holstein (P=0.3061), Jersey (P=0.3061), male (P=0.7914) or female (P=0.7914) calves. In conclusion, the INT feeding protocol failed to enhance body growth and did not affect the health status in dairy calves raised under tropical conditions. ; El objetivo de esta investigación fue evaluar el crecimiento y la salud de las becerras y becerros de las razas Holstein y Jersey bajo un protocolo de alimentación intensiva (INT) y un protocolo de alimentación tradicional (TRA) bajo condiciones tropicales. Los animales se dividieron en bloques ...
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2رسالة جامعية
المؤلفون: Soto-Soto, Isamari
المساهمون: Ortiz-Colón, Guillermo, College of Agricultural Sciences, Jiménez Cabán, Esbal, Ruíz López, Teodoro, Latorre Acevedo, José R., Department of Animal Science, Plaza Delestre, María
مصطلحات موضوعية: Hypocalcemia, Calcium supplementation, Milk production, Health events, Dairy cattle, Cows, Holstein-Friesian cattle, Milk yield
الوصف: The objectives of this experiment were to evaluate in dairy cows the effects of oral calcium supplementation of a post calving gel on the incidence of hypocalcemia and productive performance in early lactation. In a 2x2 factorial arrangement sixty (primiparous and multiparous) Holstein cows were assigned alternately according to calving date to the nontreatment or treatment with oral calcium gel supplementation. Cows in the latter group received a single dose of 54 g of oral calcium in 300mL of gel after calving. Cows in the control group received no calcium gel. Blood samples were collected thrice to analyze ionized calcium concentrations: at least 1 day before, immediately after and 5 days after calving. Productive performance and health events were recorded during the first 100 days and 50 days postpartum, respectively. Significant differences in blood calcium concentration were not found between treatments, but a tendency (P= 0.10) was observed toward a lower incidence of subclinical hypocalcemia in cows supplemented with oral calcium gel after calving. Postpartum blood calcium concentration was higher (P= 0.03) in primiparous than in multiparous cows. Oral calcium gel supplementation did not affect milk production (P= 0.71), but the interval between calving and day of peak production was shorter (P= 0.05). Cows in the control group presented more calving problems and were more susceptible to suffer diseases such as retained placenta, metritis and mastitis. ; Los objetivos de este experimento fueron evaluar en vacas lecheras los efectos de la suplementación oral de calcio en un gel después del parto, sobre la incidencia de hipocalcemia y el desempeño productivo al inicio de la lactación. En un arreglo factorial 2x2 se asignaron 60 vacas de raza Holstein primíparas y multíparas, alternando según la fecha de parto, al testigo sin tratamiento y al tratamiento de suplementación con calcio. Las vacas de este último grupo recibieron una dosis de 54g de calcio en 300mL de gel después del parto. Las vacas del grupo ...
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