A series of experiments were conducted to investigate the elimination of swainsonine in the milk of lactating ruminants following a single dose oral exposure to swainsonine (locoweed; Oxytropis sericea) and to assess subsequent subclinical effects on the mothers and their nursing young. In a preliminary experiment, lactating ewes were gavaged with locoweed providing 0.8 mg swainsonine/kg BW (n ...

Two trials were conducted to determine the effect of energy source (ENG) and ruminally degradable protein (RDP) on lactating cow performance and intake and digestion in beef steers. In Trial 1, 78 cow-calf pairs were used in a 2 x 2 factorial design to determine the effect of ENG (corn or soyhulls; SH) and RDP (with our without sunflower meal) to a forage diet for lactating beef cows. The basal...

The aim of this study was to investigate the effect of diets containing roasted soybean (R), extruded soybean (E) or their combination (RE) on dairy cow performance and milk fatty acid (FA) profile. Nine multiparous lactating Holstein cows (680 ± 25 kg BW; 90 ± 10 DIM; means ± SD) were randomly assigned to a triple 3 × 3 Latin square design. Dry matter intake (DMI), apparent nutrient dige...

The use of grazing systems for milk production is widely used globally because it a lower-cost feeding system. However, under tropical conditions, the energy content pastures became limitation to improve animal performance and efficiency while reducing environmental impact. objective our study was evaluate impact supplying different dietary sources lactating dairy cows on recovery human-edible ...

Virtual fencing is promoted as the next advancement for rotational grazing systems. This experiment compared capacity of conventional temporary electric versus virtual to contain a herd 30 lactating dairy cows within boundaries their daily pasture allocation (inclusion zone). Cows were moved each day new rectangular paddock that was divided crosswise into an inclusion and exclusion zone by sing...

The aim of this experiment was to study the effect betel leaf meal (BLM) as feed additive on milk composition and somatic cell count subclinical mastitis infected cow. design a completely randomized with five dietary treatments BLM level four replications in concentrate feed. were T0 (without meal, control), T1 (2% every day), T2 (4% T3 skip two days), T4 days). Milk samples from quarter would ...

This study aimed to analyze the principal components of meteorological variables, physiological and behavioral response cows subjected different cooling times their influence on milk quality, in dry rainfall periods, establish multiple regression models for quality. The data used came from an experiment conducted Agreste Region Pernambuco. pre-milking time was 10, 20, 30 min. control (without c...

The effect of shifting calf-weaning age on profiles of energy status (BW, BCS, and rib and rump fat) and reproductive performance of beef cows was evaluated in a 3-yr study. Pregnant and lactating crossbred beef cows (n = 408), mainly of Angus and Hereford breeding, were stratified by age and by sex and BW of their calves and assigned randomly into 2 treatments: weaning at approximately 180 d (...

Behavioral observations of cattle are important for detection of illness, injury, and estrus as well as to verify that the cattle are behaving normally. However, conducting live observations of animals managed in extensive systems, such as pasture-based dairies, can be difficult and time consuming. Activity monitors, such as those developed for use with automatic milking systems (AMS), have bee...