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Nutritive Requirements of Breeding Ewes for Maintenance, Lactation and Growth¹

Purdue University Agricultural Experiment Station³

Abstract

Dehydrated cereal grasses (rye and oats) were found to have a high nutritive value with corn and silage for breeding ewes.

Dehydrated third-cutting alfalfa hay was comparable to dehydrated cereal grass in nutritive value for breeding ewes. First-cutting alfalfa hay was only slightly better than oat straw and the second cutting approached the third cutting alfalfa in nutritive value.

The water soluble fraction of rye grass used in these experiments did not contain the supplementing factors necessary for optimum performance of breeding ewes. The residue after water extraction retained these factors in concentration approximating the original cereal grass.

The addition of protein (casein) and crystalline vitamins to the oat straw ration or a protein supplement (soybeans) and vitamins to a poor quality alfalfa hay ration improved the rations, but did not make them equal in nutritive value to rations containing dehydrated cereal grass.

¹ Journal Paper No. 216 Purdue University, Agricultural Experiment Station, Lafayette, Indiana.

² Present Address, Midwest Research Institute, Kansas City, Missouri.

³ Departments of Agricultural Chemistry and Animal Husbandry.