Research Nuggets

Viseral fat concentration not captured through BCS

Relatively little is known about changes in mass or function of internal fat deposits in dairy cows, particularly during the periparturient period. FULL STORY »

Accurate tools for cow-side measurement of BHBA concentrations

Hyperketonemia is defined as an abnormally high concentration of circulating ketone and is an indicator of excessive negative energy balance in transition dairy cows. The gold standard for diagnosing hyperketonemia is the measurement of BHBA in serum or plasma. Implementing a hyperketonemia surveillance program using DHI monthly milk test data could be a practical approach. FULL STORY »

Melatonin feeding compared to long day lighting

In lactating dairy cows, exposure to a long-day photoperiod is associated consistently with an increase in prolactin concentration and milk production. FULL STORY »

Relationships: Fertility and postpartum changes in BCS, weight

The relationship between energy status and fertility in dairy cattle was retrospectively analyzed by comparing fertility with body condition score (BCS) near artificial insemination (AI); early postpartum changes in BCS; and postpartum changes in body weight (BW). FULL STORY »

Rumination time around calving to detect disease risk

The main objective of this experiment was to evaluate the use of rumination time (RT) during the peripartum period as a tool for early disease detection. The study was carried out in an experimental freestall barn and involved 23 Italian Friesian cows (9 primiparous and 14 multiparous). FULL STORY »

Performance of cows fed Bt silage and grain

Corn grain and corn silage are major feed components in lactating dairy cow rations. Bacillus thuringiensis (Bt) is a naturally occurring soil bacterium that produces a protein that is toxic to lepidopteran insects that may damage plant tissues and reduce corn quality and yields. FULL STORY »

Effects of ration composition on IOFC and milk yield

Results of the study indicated that intermediate levels of forage cost and higher levels of total feed cost per cow per day resulted in both higher milk yield and higher IOFC. This suggests that optimal ration formulation – rather than least cost strategies – may be key to increasing milk yield and IOFC, and that profit margin may be affected more by quality of the feed rather than the cost. FULL STORY »

Forage substitutes, by-product feeds in late-lactation diets

In response to drought-induced forage shortages along with increased corn and soy prices, this study was conducted to evaluate lactation responses of dairy cows to lower-forage diets supplemented with forage substitutes. By-product feeds were used to completely replace corn grain and soybean feeds. FULL STORY »

Prepartum grouping strategies and feed bunk displacement

More than 200 nonlactating Jersey primiparous and multiparous cows were enrolled in the study. Housing prepartum close-up cows with stable pen management reduced displacements from the feed bunk and altered average daily feeding times FULL STORY »

Effects of folic acid and vitamin B12 supplementation

This study was undertaken to determine the effect of a combined folic acid and vitamin B12 supplement given in early lactation on culling rate, metabolic disorders and other diseases, and reproduction in commercial dairy herds. A total of 805 cows in 15 commercial dairy herds were involved. FULL STORY »

Effect of ambient temperature, sodium bicarbonate supplementation

The amount of water provided to cows on dairy farms can be a limiting factor for production, especially during high temperature periods. This experiment aimed to quantify water balance of dairy cows subjected to thermoneutral or high ambient temperatures. When water flows were related to dry matter intake, the quantities of evaporated water and drunk water increased by a similar range in cows submitted to high temperature, regardless of physiological stages or sodium content of diets. FULL STORY »

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