Discussion
There is a great deal of variation in the composition of milk. The factors responsible for such variation in the composition are _______.
A. Stage of Lactation
B. Intervals between milking
C. Environmental conditions at milking
D. Individual variation
Choose the correct answer from the options given below :
Answer: D
All four factors cause variation, so the answer is A, B, C and D.
The composition of milk, especially its fat and solids-not-fat content, varies with the stage of lactation (colostrum is very different from later milk, and fat rises again late in lactation), with the interval between milkings (a longer interval gives more milk with less fat), with environmental conditions such as temperature and season, and between individual animals even of the same breed and diet.
Feed, breed, age and disease such as mastitis also matter. Since all four listed factors contribute, the options naming only two or three of them are incomplete.
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