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Journal of Dairy Science Vol. 45 No. 1 55-58
© 1962 by American Dairy Science Association ®
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Value of Sterile Forage Sorghum Hybrids as Silages for Lactating Cows1

F. G. Owen, J. R. Kuiken2 and O. J. Webster3

Dairy Husbandry Department and Agronomy Department, University of Nebraska, Lincoln

ABSTRACT

Two sterile forage sorghum hybrids (RS 303F and RS 301F) have been evaluated as roughages for lactating cows. These hybrids were male sterile and produced very few seed. Two experiments were conducted. In each experiment silage was fed ad libitum as the only roughage to 12 cows in a switch-back design. In the first experiment, using Jersey cows, RS 303F was compared with corn and Axtell sorgo. Corn silage was significantly superior in FCM produced and in amount consumed; however, consumption of silage dry matter was highest for Axtell. RS 303F and Axtell were found not to differ in other respects. Body weight change and milk fat percentage did not differ significantly among treatments. In the second experiment, using Holstein and Brown Swiss cows, RS 301F was compared with Tracy silage harvested at the early-dough stage and when the grain was mature. The silage from RS 301F was significantly superior to that of Tracy harvested at early-dough in silage consumed, FCM produced, and milk fat percentage. Silages from RS 303F and mature Tracy were not different in any respect. Dry matter consumption and weight changes were not measurably different for these treatments. Sterile sorghum silages were not inferior to other sorghum silages, which suggests that the seed content of these silages should not be used as a criterion for judging their quality.

FOOTNOTES

1 Published with the approval of the Director as paper No. 1159 Journal Series, Nebraska Agricultural Experiment Station, Lincoln.

2 Present address: DeKalb, Illinois.

3 Crops Research Division, Agricultural Research Service, USDA, Lincoln, Nebraska.






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