Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.713698
Title: The effects of previous dietary lysine experience on subsequent growth response in pigs
Author: Taylor, Amy Elizabeth
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2011
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Abstract:
Compensatory growth is a phenomenon in which an animal accelerates its growth above normal rates after a period of suppressed growth, usually caused by feed restriction. A number of experiments were conducted to evaluate the effects of lysine restriction on subsequent growth performance. Feeding a low lysine diet for a period of three weeks post weaning reduced feed intake, rate of gain and feed efficiency. At the end of restriction, restricted pigs were lighter, had less muscle tissue and more fat tissue compared to control pigs. These pigs also had reduced blood urea nitrogen (BUN) and non-esterified fatty acid (NEFA) concentrations in the blood. Upon re-feeding pigs were able to show full compensatory growth, however factors such as genotype, lysine concentration in the realimentation diet and the severity of restriction affected the extent in which compensatory growth was carried out, therefore full compensation was not always observed. During realimentation pigs that showed full compensation were able to match the feed intake of control pigs, increase their rate of gain above that of control pigs and use their feed more efficiently. Pigs previously fed a low lysine diet required high lysine concentrations in the realimentation diet in order to show full compensatory growth. Pigs that did not compensate after restriction during the wearer stage were unable to match the feed intake of control pigs upon re-feeding and were therefore unable to increase their rate of gain above that of control pigs. Feeding pigs a low lysine diet during either the grower or finisher stage did not result in compensatory growth. As conipensatory growth was only observed in two out of four experiments it is vital that further research is carried out before considering compensatory growth as a cost effective feeding strategy in the pig industry.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.713698  DOI: Not available
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