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328 THE INDIAN JOURNAL OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY [ III, IV.

Milk Yield.

Before giving these it is necessary to state the average number of completed
lactations per cow in each generation.

Generation	Including all animals	Herd minus poor milkers, etc.
F. 1 ..........	36	4.0
F. 2 ..........	3.5	3.9
F. 3 ..........	2.4	2.5

It is therefore seen that F.1 and F.2 have reached their best, whereas F.3 have not.

The following statement includes all cows born in the experiment and shows
the yields of the specially selected country dams.

Class	Average yield per lactation	Average daily average	Average days dry	Average maximum yield
	lb.	lb.		lb.
15 Scindi cows.....	3,431	120	186	4,505
27 F. 1 cows......	5,021	14.8	113	6,268
23 F. 2 cows......	3,296	12.3	151	4,247
11 F. 3 cows......	3,626	12.4	148	4,516

It must be noted that the Sindhi cows were specially selected for their milk
yields from a large herd, therefore selection in the progeny should be continued ;
poor and abnormal milkers, also long dry periods are omitted in order to arrive
at a proper comparison and this is seen from the following:—

Class	Average yield per lactation	Average daily average	Average days dry	Average maximum yield	Average No. of days in milk
	lb.	lb.		lb.
15 Scindi cows . . .	3,431	12.0	186	4,505	286
23 F. 1 cows...	5,122	16.1	83	6,231	318
19 F. 2 cows...	4,068	14.0	97	4,919	290
9 F. 3 cows...	4,151	13.3	94	4,550	304