19I9J DAIRY FARMING DAIRYING. 79 



periods on two grain rations, corn cliop and peanut feed (1:1) and corn chop 

 and cottonseed meal (3:2). Tlie cows wlien on the peanut ration produced 

 178.7 lbs. more milk and 8.85 lbs. more butter fat than they did on the cotton- 

 seed meal ration, but owing to the fact that about 50 per cent more protein sup- 

 plement was consumed, the increased production was not profitable, since peanut 

 feed and cottonseed meal were purchased at almost exactly the same price. 

 A third lot of 6 cows fed during the entire 12 weeks on corn chop, peanut 

 feed, and cottonseed meal (6:3:2) produced 583 lbs. of milk and 1.08 lbs. of 

 butter fat more than tlie other cows when on the cottonseed meal ration. The 

 third ration is considered the most economical of those tested. In assigning 

 the cows to lots, care was taken " to divide them as equally as possible with 

 respect to age, production, size, feeding capacity, stage of lactation, and 

 natural productive capacity." 



Proximate analyses of the samples of peanut feed and cottonseed meal used 

 are reported. 



It is held that under Texas conditions, where proteins are generally cheaper 

 than carbohydrates, the proper basis for comparing feeds is the percentage of 

 total digestible nutrients, and not the protein content. 



2. Comparison of methods of preparation of veliiet beans for dairy cows 

 (pp. 10-14). The grain mixture used in this experiment consisted of corn bran, 

 cottonseed meal, and velvet beans (2:1:3), and the roughage of pasture. Each 

 of four different ways of preparing the beans was tested in rotation with 4 

 lots of 3 cows, each lot receiving beans prepared by a particular method for 

 20 days. The amount of grain fed in each period was the same. The milk 

 produced by the cows when the beans were fed whole totaled 6,337 lbs., when 

 the beans were cracked 6,345 lbs., when cracked and soaked in water 6,398 

 lbs., and when ground 6,690 lbs. The feeding of cracked beans soaked, and of 

 ground beans, was accompanied by an increase of 7 or 8 lbs. of butter fat. 

 The increase in milk resulting from grinding was about 57 gal. for a ton of 

 beans, which at 40 cts. a gallon is worth $22.80. Since mills will often grind 

 the beans for ?2.50 a ton, and the grinding can be done on many farms for $5, 

 the operation is deemed distinctly profitable. No differences in palatability 

 apparently resulted from the various methods of preparation. 



Proximate analyses of the samples of corn bran, cottonseed meal, and velvet 

 bean feed used are presented. The milk and butter fat I'ecords of each lot by 

 5-day intervals are also tabulated. 



Some aspects of the physiology of mammary secretion, R. L. Hill (Jour. 

 Amer. Vet. Med. Assoc, 51 (1917), No. 5, pp. 6^2-654). — This paper repeats to 

 some extent data already published (E. S. R., 32, p. 871) showing increased 

 milk flow and fat yield in a goat as the immediate result of pituitrin injec- 

 tions, and includes confirmatory data from three other goats. Milk analyses 

 •which are published show that pituitrin has no influence on any of the milk 

 solids except the fat. 



An exceptional case of milk secretion and its bearing' on the theories con- 

 cerning- mammary development, R. L. Hiu. (Jour. Dairy Sci., 2 (1919), No. 1 

 pp. 19-27, figs. 3). — The case is described of a doe kid at the Maryland Experi- 

 ment Station, which was found to have well-developed mammae and an udder 

 full of milk before she was 4 months old. The fluid had the normal composi- 

 tion of goat's milk. The animal was milked at intervals for about 6 months. 

 That the lactation differed from a normal post-partum one Is indicated bj 

 the fact that relatively long intervals, even 19 days, between milkings did 

 not result in cessation of flow. 



" This kid had not reached sexual maturity, so any theory of mammary 

 growth or milk secretion involving the ovaries, corpora lutea, fetus, or placenta 



