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Evaluation of Grain Corn Grown in New Brunswick for Dairy Cows

Corn, also called Indian corn or maize, is a kind of cereal plant of the grass family (Poaceae). It is one of the most widely distributed food crops and also the primary grain used in animal feed in North America, supplying a greater energy density than smaller grains.

In recent years, new earlier maturing corn hybrids are now being grown in New Brunswick (NB), reducing the need to import corn from the United States and showing the potential to improve the sustainability of the local dairy industry. However, there is debate within the industry concerning the value and best use of the grain. So the authors conducted an experiment to determine the nutritive value and assess lactational performance of cows provided with imported dry corn, local dry corn, high moisture (HM) shelled corn and high moisture corncob meal (HMCCM). And three samples of each product were obtained. After the experiment, in sacco digestibility data were analyzed using the ANOVA procedure of Minitab 16 with samples as random variables and animal performance parameters were analyzed using the GLM procedure of Minitab.

Through analyzing, the results showed that rates and extent of digestion were similar for local and Ontario corn regardless of presentation for crude protein and starch, but acid detergent fiber, neutral detergent fiber and dry matter digestibility values were lower for HMCCM than other treatments. A 4 × 4 Latin square study was conducted with 16 Holstein cows and 28 day feeding periods. Milk production and milk protein production were higher (P < 0.05) with the locally produced dry corn than with other treatments. Energy corrected milk was lowest with the HMCCM diet.

In summary, the feeding value of corn produced in New Brunswick is similar to that produced in Ontario and HM and HMCCM provide viable options for storing locally produced corn.

Article by Essi H. Evans, et al, from Canada.

Full access: http://mrw.so/1zaElz    
Image by Akawat Kitikunlanan, from Flickr-cc.


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