22 



BULLETIN 945, U. S. DEPARTMENT OF AGRICULTURE. 



It would, perhaps, be fair to compare cow 59 with cows 67 and 

 70 ; cow 64 with cow 21 ; and cow 213 with cow 214. The figures for 

 cow 59 represent approximately the average performance for the 

 heifers of the general herd with their first calves. Cow 67 is a 

 half sister of cow 59. The two animals have the same sire ; the 

 dam of 67 has a somewhat better record than that of 59. Cow 70 

 was selected in order to try the effects of phosphate feeding in an 

 unfavorable case. Her mother had the poorest record of all the cows 

 in the herd except two, and she herself was of unpromising appear- 

 ance. Cow 64 was milked only twice a day ; and cow 21 three times. 

 The difference in the milk yields is, however, larger than is generally 

 produced by this difference in treatment. Cows 213 and 214 were 

 half sisters, both being daughters of the same sire. The dam of 

 cow 213 had a decidedly better record than the dam of cow 214. 

 Cow 213 was milked only twice a day, and cow 214 three times, but 

 the difference in milk yields is very much greater than could be ac- 

 counted for by this difference in treatment. 



Table 3. — Animals tvliich had been on test during the year preceding the periods 

 of control and phosphate feeding. 



CONTROLS. 





Date of birth. 



Breed. 



Date of calving. 



Days dry. 



Milk yield.i 



Fat yield.i 



"3 

 o 



Test period. 



After control 



or phosphate 



feeding. 



Before 



test 



period. 



o 3 

 a a) 

 ■2 

 o 



*-t ©^ 



o"o 



u (ST1 

 -g-d CD 

 g ftft 



o 



'§ 



ft 



1 



EH 



3ft ft 

 ® P..2 



o 



■g 



ft 



<D 



CD 



— 3. 



a d3 o 



g,qt| 



ftS 

 ea ft 



< 



227 



9^9 



Aug. 2, 1915 



Mar. 31,1916 

 Nov. 10,1914 



Holstein 



do 



Apr. 18,1918 



Nov. 29,1918 

 Sept. 27, 1918 



Jan. 11,1920 



Mar. 15,1920 

 Feb. 9, 1920 



Days. 



First 



calf. 



...do.. 



59 



Days. 

 137 



58 

 112 



Lbs. 

 1,674 



1,591 



1,876 



Lbs. 

 2,019 



2,046 

 1,881 



Lbs. 

 61.8 



45.5 

 64.2 



Lbs. 

 83.8 



67.5 



''■HI 



do 



80.9 









EXPERIMENT ANIMALS. 



228 



22B 

 348 



Sept. 2,1915 



Nov. 8,1915 

 Mar. 15,1916 



Holstein. 



.do 



.do 



Apr. 4, 1918 



May 28,1918 

 Jan. 22,1919 



Dec. 30,1919 



Jan. 31,1920 

 June 17,1920 



First 



calf. 



..do.. 



..do.. 



79 



1,429 



1,817 



1,594 



2,016 



2,078 

 1,611 



44.7 



53.8 

 51.0 



64.9 



71.7 

 45.1 



' The figures in these columns represent the milk and fat yields from the tenth to the fortieth day after 

 calving, except in the case of cow 229. In her case they represent the milk and fat yields from the twentieth 

 to the thirty-fifth day after calving multiplied by 2. It was necessary to take these figures i nstead of the 

 usual ones, as she was sick for some days after calving in 1920, and suffered a severe cut in her rations, and 

 she became sick again on the thirty-sixth day after calving. 



It is not necessary to make any detailed comment on the results 

 given in Table 3. 



The differences in milk yield as between the cows fed phosphate and 

 those fed the basal ration alone are so small as to be insignificant. It 

 follows that the favorable influence of the phosphate feeding is 



