156 Structural patterns in dairy cow efficiency responses to supplementation

Dairy Cow Responses to Sources and Amounts of Supplemental Protein

Underfeeding or overfeeding CP to dairy cows can have detrimental effects on milk production, efficiency of nutrient utilization, reproduction, the environment, and the overall profitability of the dairy operation. Therefore, the amount and source of CP to feed must be determined if we are to optimize productivity, maximize nutrient utilization, avoid polluting the environment, and increase pro...

Grazing cow and calf responses to zinc supplementation.

This experiment evaluated weight gain responses to supplemental Zn by cows and calves grazing forage containing less than 20 ppm Zn. One hundred cow-calf pairs in each of 2 years and 120 paird in a third year were pastured together over a 63- to 77-day preliminary period during which cows were exposed to bulls. Each experimental period began in mid-June after bulls were removed and continued fo...

Metabolic responses of adipose tissue in the periparturient dairy cow

The relation of the post-partum breeding interval to reproductive efficiency in the dairy cow.

F OR profitable milk production the dairy cow must reproduce regularly. An interval of i~ to 13 months between calves usually is considered satisfactory. Cows calving every i~ months or less had higher yields per day for the interval between calves than did cows that required more than ~ months before reproducing in studies by Gaines and Palfrey (i931) and Chapman and Casida (I935). This observ...

Fat Supplementation to the Periparturient Dairy Cow: Does Fatty Acid Profile Matter?

The addition of supplemental fatty acid (FA) sources to diets is a common practice in dairy nutrition to increase dietary energy density and to support milk production. Recently, the effects of individual FA on digestibility, metabolism, and production responses of dairy cows has received renewed attention. In fresh cows, the high metabolic demand of lactation and reduced DMI during the immedia...