By Roger G. Petersen
This article presents statistical and biometrical tactics for designing, undertaking, examining and studying box experiments. It addresses an important learn issues in agriculture, together with agronomy, breeding and pasture trials; farming structures learn; and intercropping examine.
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Extra info for Agricultural Field Experiments
Corbett, S. M. Forbes, unpublished observations). , 1993). Restriction of food intake gives rise to increases in ‘working’ for food in an operant conditioning situation, but normal farm environments do not provide facilities for foraging. Therefore, animals develop stereotypies such as chewing chains; ingestion of even a small amount of food stimulates such activities. Pregnant sows are usually restricted to about 60% of their ad libitum intake and such animals have a high rate of working for food, even just after their ration has been consumed.
Although there appear to be no reports in the literature of balloon inﬂation in the porcine stomach, loading young pigs with hypertonic saline or water equal in volume to the volume of milk taken voluntarily after a 3-h fast depressed intake. As pigs grow older they can compensate better for diet dilution (see Chapter 11). Pekas (1983) loaded the stomachs of young pigs daily through a cannula, which led to a reduction in voluntary intake that almost exactly compensated for the weight of food introduced.
The use of straw bedding and/or the provision of ‘toys’ is helpful as it gives the pigs more interest and activity. Belly nosing in early-weaned piglets is a response to the lack of the mother. Pigs also show increased tail biting when the diet is deﬁcient in salt or protein. This is probably a general increase in oral activity rather than a speciﬁc alleviation of the nutrient deﬁciency, as the little blood obtained would not signiﬁcantly improve their salt or protein status (Fraser and Broom, 1997).