| Popis: |
THE results of early experiments comparing soybean oil meal with meat scrap and fish meal were not favorable for the soybean oil meal (Dougherty, 1915; Lewis, 1917). However, it was shown by Philips and Hauge (1925) and Kempster (1930) that minerals were a limiting factor and that when proper supplementation of minerals was made the egg production with soybean oil meal was comparable with that secured with rations containing animal protein. Similar results were reported by a number of other workers (Kennard and White, 1922; Robertson and Baskett, 1928, 1929; Lomax, 1930; Suzuki and Hatano, 1930). Halpin, Holmes and Hart (1934) stated that soybean oil meal could be used to replace a part of the dried milk and meat scrap in a laying ration, but should not be relied on as a total substitute. Halpin, Holmes and Hayward (1936) concluded that soybean oil meals produced at high temperatures are more . . . |
