1920] ANIMAL PRODUCTION. 71 



average daily gain was 0.54 lb., but despite the fact that only 3.3 lbs. of grain 

 were required for a pound of gain this " standard corn-belt ration " was too 

 costly in Hawaii to be fed profitably. 



Hog-feeding experiments with a self-feeder, L. A. Henke (Col. Hawaii 

 Bui. 6 {1919), pp. 24-27). — Two experiments are reported as follows: 



I. Siocet potatoes v. cassava meal (pp. 24-26). — A lot of three pigs were fed 

 20 lbs. of green alfalfa a day and were allowed free choice of sliced undried 

 sweet potatoes, linseed meal, and tankage for 70 days beginning March 19, 1919. 

 They made an average daily gain of 0.51 lb. per head and consumed 8.6 lbs. 

 of concentrates per pound of gain. Of the feeds selected 76 per cent were 

 sweet potatoes, 14 per cent linseed meal, and 10 per cent tankage. Another lot 

 of three were fed similarly except that cassava meal (roots sliced, dried, and 

 ground) replaced the sweet potatoes. The average daily gain was 0.4 lb., and 

 excluding the alfalfa 4.6 lbs. of feed were required for a pound of gain. Cas- 

 sava meal constituted 76 per cent of the concentrates eaten, linseed meal 18 

 per cent, and tankage 6 per cent. It is concluded that a pound of cassava meal 

 is about equal in feeding value to 1.8 lbs. of the sweet potatoes. 



II. Feeds selected by hogs (pp. 26, 27). — During the experiments noted above, 

 a third lot, consisting of three 3-months-old Berkshires were given the choice of 

 nine different feeds. The percentages selected were as follows : Sweet potatoes 

 38, cassava meal 22, rolled barley 11, corn 9, algaroba meal 7, rice bran 4, wheat 

 middlings 3, linseed meal 3, and tankage 3. It is pointed out that the hogs ate 

 local tropical crops like sweet potatoes and cassava in preference to high-priced 

 imported feeds. 



Studies on color in swine. — I, The hereditary relationship of the black 

 of the Hampshire and the red of tlie Duroc-Jersey, O. Lloyd-Jones and 

 J. M. BvvAED (Iowa Sta. Research Bui. 53 (1919), pp. 203-208). — Crosses are 

 reported indicating that Hampshire black and Duroc-Jersey red form a simple 

 pair of allelomorphs, with complete dominance of the black. Back-cros.sed on 

 red the heterozygotes of the Fi and subsequent generations produced 56 black 

 and 66 self red young. ISIated inter se the FiS produced 45 blacks and 21 self 

 reds. These totals do not include the progeny of a registered Hampshire boar, 

 heterozygous for black, some of whose red offspring showed black spots. This 

 boar sired 13 black, 4 siwtted, and 7 self red pigs by red sows, and 158 black, 

 15 spotted, and 15 self red pigs by heterozygous black sows out of crosses where 

 no spotting occurred. " The amount of black on those ' spotted ' pigs was small, 

 consisting in general of from one to a dozen areas about the size of a dollar, 

 scattered promiscuously over the coat." [This boar's production of the three 

 classes of offspring renders untenable the hypothesis that the black, spotted, 

 and red genes form a set of triple allelomorphs similar to the black extension 

 set in other mammal.s.] 



The Hampshire black, it is pointed out, differs genetically from the black 

 of the Berkshire and the Poland-China inasmuch as individuals of the latter 

 breeds crossed with Duroc-Jerseys produce young predominantly red but with 

 black spots. Moreover, Berkshire and Poland-China black is known to be en- 

 tirely recessive to the white of Yorkshires and Chester-Whites, whereas the 

 authors state (on the basis of a Hampshire breeder's report and personal ex- 

 perience with one litter) that the Hampshire X Chester White FiS are in 

 genei-al blue roans belted with white. 



The inheritance of the white belt of Hampshires pi-oved complicated and is 

 not reported on. 



History of the Duroc, R. J. Evans ([Chicoffo'i : James J. Doty Pub. Co., 

 1918, pp. 83, pis. 9). — An account of some famous Duroc-Jersey animals. 

 182230°— 20 6 



