Effects of rice bran and glycerin supplementation on metabolic and productive responses of beef cows

Abstract

Fifty-seven primiparous Angus, Hereford, and crossbred cows were used to study the effect of strategic supplementation on metabolic, productive, and reproductive responses. The experiment had two periods including four phases: prepartum supplementation (phase I; 52 days), early postpartum (phase II; 43 days), pre-mating supplementation (phase III; 21 days), and the last phase including mating, gestation, and lactation until weaning (phase IV; 103 days). Phases I and II were considered as period 1, and phases III and IV were considered as period 2. During phase I (−52±2 days before calving to birth), half of the cows received a supplement (S-), and the rest only grazed native swards (C-). For phase III (59±2 days postpartum [DPP] until mating), cows from the previous treatments (C-or S-) were sorted in two levels of pre-mating supplementation, supplemented (-S) or not supplemented (-C), resulting in four treatment combinations (CC, CS, SC, and SS). The supplement was 1 kg dry matter/cow per day of whole rice bran and 550 mL/cow per day of crude glycerin. In period 1, cows receiving prepartum supplementation increased concentration of cholesterol, glucose, and albumin and decreased concentration of non-esterified fatty acids, betahydroxybutyrate, and urea. This improvement in energy balance was reflected in a higher body condition score at calving. Alternatively, in period 2, pre-mating supplementation only increased cholesterol concentration. None of the supplementation periods affected the weaning weight of calves. Prepartum, but not pre-mating, supplementation increased total pregnancy rate. A short prepartum supplementation improves pregnancy rate of primiparous cows managed under extensive production systems. However, there is no additional benefit of supplementation during the pre-mating period.

The prevalence of parasitic infections among slaughtered animals in mechanical abattoir

“…A recent study in Indonesia reported that grazing habits and animal nutrition affected the infection rate. The animals eating farm-made food had a higher infection rate of 43.80% than animals whose food is made commercially 31.68%, which was statistically significant with an odds ratio of 1.68 CL (1.072-2.634) (35). Also, this study evaluated gender as a risk factor where the infections among male cattle are found to be more frequent than female for two reasons.…”

Efecto de la suplementación energético-proteica sobre el desempeño productivo en vacas Romosinuano durante el pre y posparto

“…Los desequilibrios homeostáticos que ocurren durante el último tercio de la gestación y en el posparto temprano, caracterizados principalmente por el balance energético negativo (BEN), una condición que representa cambios importantes en la concentración de metabolitos y en la disminución de la condición corporal (CC) (Clariget et al, 2020), estarían relacionados principalmente a condiciones de restricción alimentaria, que según Claramunt et al (2020) pueden contrarrestarse mediante el adecuado manejo de la disponibilidad de forraje en la pradera y, complementariamente, con la oferta de alimentos energéticos y proteicos, que además de enriquecer la calidad nutricional de las dietas basadas en forrajes tropicales, contribu-yen a aumentar el consumo y la digestibilidad de los alimentos y el desempeño productivo en periodos críticos como la gestación y posparto en vacas (Mestra et al, 2013;Sotelo et al, 2018). Sin embargo, estudios relacionados con los efectos de la suplementación en vacas de aptitud cárnica, durante el pre y posparto en condiciones del trópico, presentan resultados controversiales sobre la reducción del BEN, y el desempeño productivo y reproductivo de los animales (Lopes et al, 2016).…”