DAIRY FARMING DAIRYING. 273 



The length of time required in these experiments for demonstrating the in- 

 jurious (MTocts of depriving cows of s:ilt raises the question in the mind of the 

 author if tlie periods usually ciiipliiycd in feeding experiments have been suffi- 

 ficntly long (o show tlic iiliysioiogical cfrcet of any ])articulai" food. 



Influence of dehorning and tuberculin testing on the milk secretion of 

 dairy cows, F. W. \Voll and G. C. IIi'.mphrey ( ir/.S(o;(.s//; ,Sta. h'pt. 1905, pp. 

 ih^-Ll'i). — Fourteen cows were subjected to the tuberculin test and then de- 

 liorned. The millc of these cows as regards yield and composition was com- 

 pared with the milk of cows dehorncnl but not tuberculin tested, of cows tuber- 

 (ulin tested but not dehorned, and of cows neither dehorned nor tuberculin 

 tested. The result showed on an average a decrease of about 8 per cent in the 

 yield of milk for the first few days after dehorning, but a loss of only about 2 

 per cent in the yield of butter fat. Dehorning, therefore, increased the fat con- 

 tent of the milk 0.27 per cent. These results are noted as being in accord with 

 the results of investigations at other exi)eriment stations which are cited. The 

 tul)ercidin test was ai)])arentl.v without effect upon milk secretion. 



The university dairy herd, 1904-5, G. C. Humphrey and F. W. Woll ( Tf/s- 

 coiisiii sia. If III. Ulti.'), pp. ()<l-l()7, 1)1. 1, figs. 12). — Descriptions and illustrations 

 are given of 12 cows added to ihe herd since the previous report (E. S. R., 16, 

 p. Slo). and records of 34 cows for the full year are reported and discussed.- 



The most profitable cow was a Jersey, which produced 6.790.9 lbs. of milk 

 and 389.87 lbs. of butter fat at a net profit over cost of feed of ,$61.22. The 

 average production of the 34 cows was 6,439.5 lbs. of milk and 280.57 lbs. of 

 Itutter fat. The average net pi'ofit per head was $35.20. As compared with 

 the previous year, the results show a decrease in average production and in 

 net i)rofit, attributed in iiart to poorer jiasturage and an inferior quality of 

 silage. 



The average production of the 34 cows by breeds was as follow^s : Jersey (6 

 cows), .5.816.6 lbs. of milk and 31.5.8 lbs. of fat; Guernsey (9 cows), 5,193.5 lbs. 

 of milk and 270.8 lbs. of fat; Holstein (7 cows), 8,-372.5 lbs. of milk and 296.29 

 lbs. of fat; Shorthorn (6 cows), 6,116.2 lbs. of milk and 2.34..52 lbs. of fat; Red 

 Polled (4 cows), 7,050.6 lbs. of milk and 290.;»7 lbs. of fat; and Brown Swiss 

 (2 cows), 6.898.2 lbs. of milk and 281.14 lbs. of fat. The results as regards 

 I)utter-fat production and net profit were, therefore, favorable to the Jerseys. 

 The data, however, are considered insufl^cient to warrant general deductions 

 concerning the value of the various breeds. 



.\s in the previous repoi'ts, a comparison was made of the cows by types. 

 Twelve cows of the extreme dairy type produced on an average 5,958.6 lbs. 

 of milk and 286.0(> lbs. of fat at 'a profit over cost of feed of $37.92. Ten cows 

 of the large dairy type produced 6.874.5 lbs. of milk and 297.34 lbs. of fat at 

 a jirofit of .$.')6.39. Twelve cows of the dual purpose type produced 6,558 lbs. of 

 milk and 261. 11 lbs. of fat at a profit of $31.49. The average net profit of the 3 types 

 l( .r the period from 1898 tol905 was respectively $39.08, $.39.31, and $35.22. On the 

 whole, the large dairy cows have been the most profitable. It is therefore 

 liclieved that attention should be given to the matter of size in the selection of 

 dairy animals. 



.Analyses are given of the feeding stuffs used. A conqtarison of the ration 

 fed during the year with those of previous years showed a maximum yield and 

 fat content of milk coincident with a narrowing of the ration. It is not believed 

 that a narrower nutritive ratio than 1 : (i will be found advantageous except 

 in the case of high producers, li is suggested that the nutritive ratio may 

 profitably range between 1 :6 and 1 : 7. the dry matter from 20 to 24 lbs., and 

 the digestilile protein from 2 to 2.4 lbs. 



1112.5— No. 3—06 M 6 



