LACTATIONAL PERFORMANCE OF DAIRY-COWS FED RAW SOYBEANS, WITH OR WITHOUT ANIMAL BY-PRODUCT PROTEINS, OR ROASTED SOYBEANS

Citation
Rr. Grummer et al., LACTATIONAL PERFORMANCE OF DAIRY-COWS FED RAW SOYBEANS, WITH OR WITHOUT ANIMAL BY-PRODUCT PROTEINS, OR ROASTED SOYBEANS, Journal of dairy science, 77(5), 1994, pp. 1354-1359
Citations number
20
Categorie Soggetti
Agriculture Dairy & AnumalScience","Food Science & Tenology
Journal title
ISSN journal
00220302
Volume
77
Issue
5
Year of publication
1994
Pages
1354 - 1359
Database
ISI
SICI code
0022-0302(1994)77:5<1354:LPODFR>2.0.ZU;2-7
Abstract
Twelve multiparous Holstein cows averaged 10 wk postpartum and were us ed in a replicated 3 x 3 Latin square design to compare two feeding st rategies for increasing the ratio of dietary undegradable to degradabl e protein. Treatments were raw soybeans, with or without meat and bone meal plus blood meal, and roasted soybeans as the primary protein sup plements. Meat and bone meal and blood meal were fed at 4.0 and .9% of dietary DM, respectively. Basal diets were 30% alfalfa silage, 18% co rn silage, and 52% corn-based concentrate mix. Diets were formulated t o be isonitrogenous and isocaloric. Estimated undegradable protein con tents, as a percentage of total CP, were 32.2, 36.2, and 34.3 for diet s containing raw soybeans, raw soybeans plus animal by-product protein s, and roasted soybeans, respectively. The undegradable protein estima tes were calculated from NRC values for basal feeds and from results o f in vitro analysis of test protein supplements. Yields of milk and 3. 5% FCM of cows receiving raw soybeans plus animal by-product proteins (45.5 and 43.4 kg/d) and roasted soybeans (44.7 and 42.7 kg/d) were gr eater than those of cows receiving raw soybeans alone (43.2 and 41.3 k g/d). Increasing the ratio of undegradable to degradable dietary prote in also increased yields of milk protein and fat. No differences occur red in lactation performance among cows fed the two diets containing h igher undegradable protein. The DMI was not influenced by treatment. I ncreasing the ratio of undegradable to degradable dietary protein by f eeding animal by-product proteins or heated soybeans enhanced lactatio n performance.