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 »

‘Stink bug’ odor compounds do not transfer into milk

The brown marmorated stink bug (BMSB), Halyomorpha halys, is an invasive insect responsible for severe damage to agricultural crops, including feed crops, in the northeastern United States. This study evaluated whether corn crops with high infestation of BMSB posed a risk to milk quality, feed intake, and silage quality. This work is the first to demonstrate that the bug stink odor compound does not transfer to milk when delivered directly to the rumen. Moreover, it cannot be detected in feed following ensiling. FULL STORY »

Shredlage feeding study underway at UW-Madison

One of the most heavily attended breakout sessions at the 2014 Professional Dairy Producers of Wisconsin Business Conference, March 13-14, was a session on “shredlage.” During that session, Dr. Randy Shaver, University of Wisconsin-Madison dairy scientist, discussed a major feeding study underway at UW-Madison’s Arlington research farm. FULL STORY »

Feeding for designer manure?

Macro minerals must be fed at appropriate levels to optimize animal production and health. Overfeeding leads to increased excretion in feces and urine, and over-application can lead to excessive concentrations in soils which impact crop production. In a paper (Impact of Macro Mineral Nutrition (Na, K, Mg, Ca) of Dairy Cows on Nutrient Excretion) presented at the 2014 Idaho Nutrient Management Conference, University of Idaho Extension dairy specialist Rick Norell and fellow researcher Mireille Chahine discuss nutrient balance studies for evaluating mineral excretion, methods for estimating excretion on farms, and procedures for managing nutrient excretion on farms. FULL STORY »

Effect of monensin in lactating dairy cow diets

The objective of this study was to determine the effects of monensin (M) supplementation on lactation performance of dairy cows fed diets of either reduced (RS) or normal (NS) starch concentrations as total mixed rations. FULL STORY »

Milk quality from cows fed DDGS

The results of this study indicate that feeding of DDGS to lactating dairy cows, under controlled conditions, does not have negative effects on milk oxidative stability or flavor. However, feeding 25% DDGS did negatively impact milk production and changed milk fatty acid profile. FULL STORY »

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