Question

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An egg farmer is experimenting with different feed rations with the aim of increasing his production whilst reducing the cost of the feed per egg produced. The data from the two feeding experiments are given below.

Experiment 1

Protein concentration in feed (%)	10	11	12	13	14	15	16
Total vitamin level (mg/kg)	100	100	100	100	100	100	100
Cost of feed ration per 100 hens per day	6.00	7.00	7.50	8.00	8.50	8.75	9.00
Number of eggs per 100 hens per day	70	70	75	80	85	80	80

Experiment 2

Protein concentration in feed (%)	14	14	14	14	14	14	14
Total vitamin level (mg/kg)	50	75	100	125	150	175	200
cost of feed ration per 100 hens per day	8.00	8.25	8.50	8.75	9.00	9.25	9.50
Number of eggs per 100 hens per day	70	80	85	90	95	95	95

What are the independent variables in each of the two experiments?

• A. Experiment 1 - Maximum daily egg production; Experiment 2 - Maximum daily egg production
• B. Experiment 1 - Protein concentration in the feed; Experiment 2 - Total vitamin level in the feed
• C. Experiment 1 - Total vitamin level in the feed; Experiment 2 - Protein concentration in feed
• D. Experiment 1 - Cost of feed ration per egg produced; Experiment 2 -Cost of feed ration per egg produced

Answer 1

The correct option is B Experiment 1 - Protein concentration in the feed; Experiment 2 - Total vitamin level in the feed

In experiment 1 the protein concentration is controlled or changed. So as to check the effect on cost of feed ration and number of eggs produced. Therefore it an independent variable

In experiment 2 total vitamin level in the feed is controlled or changed. So as to check the effect on cost of feed ration and number of egg produced. Therefore it is an independent variable.

So, the correct answer is 'Experiment 1 - Protein concentration in the feed; Experiment 2 - Total vitamin level in the feed'