Title page for ETD etd-08022012-110745


Document Type Master's Dissertation
Author Kruger, Werner
Email wkruger12@gmail.com
URN etd-08022012-110745
Document Title Growth performance and carcass characteristics of two baconer pig genotypes on three dietary treatments
Degree MSc(Agric)
Department Animal and Wildlife Sciences
Supervisor
Advisor Name Title
Dr C Janse van Rensburg Co-Supervisor
Prof N H Casey Supervisor
Keywords
  • dietary treatments
  • pig genotypes
Date 2012-04-24
Availability restricted
Abstract
The production performance of the two Topigs SA pig genotypes, the Tempo and Top Pi progeny, were compared when fed on three different feeding regimes. A 2x3 factorial design was used for this trial. The aim of the study was to determine the effects of dietary energy level on the growth performance and carcass characteristics of the two genotypes offered by Topigs SA. These feeding regimes consisted of three phases each, a starter, grower and finisher, and differed only in terms of digestible energy level. A switch from one phase to the next was made every 4 weeks. The diets were fed ad libitum. The prescribed energy levels for the Tempo progeny were used as a control. Two feeding regimes, one with lower and one with higher energy levels than the control were also fed. The DE levels for the high energy phases were 14.68 MJ/kg for the starter, 14.43 MJ/kg for the grower and 14.19 MJ/kg for the finisher. For the control phases the DE levels were 14.22 MJ/kg for the starter, 14.05 MJ/kg for the grower and 13.79 MJ/kg for the finisher. The low energy phases had DE levels of 13.74 MJ/kg for the starter, 13.45 MJ/kg for the grower and 13.1 MJ/kg for the finisher. Individual daily feed intake (FID) and average daily gain (ADG) were recorded for 144 individually housed gilts, 72 of each genotype. The trial consisted of three repetitions with 48 pigs per repetition and was performed over three consecutive periods. Data was recorded for the period from 10 weeks of age, until slaughter at 105 kg live weight. From the growth data the feed conversion ratio was calculated. At slaughter, carcass weight, P2 back fat depth and eye muscle (Longisimus dorsi) depth was measured. The P2 and eye muscle measurements were used to calculate the lean meat percentage for each carcass. Only slaughter data from two of the periods were used due to inaccuracies during the slaughter process of the animals from the first repetition. The dietary energy level had significant effects on slaughter weight, ADG, FCR, carcass weight and P2 measurements. The control did not differ significantly from the high group, but differences were observed between the high and low treatments. Slaughter weight increased by 4.78 kg, from 102.97 kg on the low energy diets to 107.75 kg on the high energy diets. ADG was 1.01kg with a 2.44 kg FCR on the high energy treatments compared to the 0.94 kg ADG and 2.58 kg FCR attained on the low energy treatments. Pigs on the high energy treatments produced carcasses that weighed on average 81.77 kg with P2 measurements of 15.66 mm compared to the pigs on the low energy treatments that produced carcasses that weighed on average 77.3 kg with P2 measurements averaging 14.13 mm. The genotypes differed significantly for slaughter weight, ADG, ADFI, carcass weight, P2, eye muscle diameter and lean meat percentage. The Top Pi pigs reached a slaughter weight of 101.89 kg and carcass mass of 76.8 kg with an ADG of 0.93 kg/day and an ADFI of 2.34 kg/day. Compared to this, the Tempo pigs reached an average slaughter weight of 109.39 kg and carcass mass of 83.56 kg with an ADG of 1.03 kg/day and an ADFI of 2.59 kg/day. Average P2 and loin eye muscle diameter measurements were 14.66 mm and 48.1 mm for the Top Pi pigs and 16.38 mm and 45.14 mm for the Tempo pigs. The Top Pi carcasses had a lean meat percentage of 68.37% compared to 67.22% for the Tempo carcasses. The data suggests that under the conditions of this study there are indeed significant differences in growth performance and carcass characteristics between these two genotypes and that they react differently to variations in dietary energy level. The results however show a great deal of variation.

Copyright 2011, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Kruger, W 2011, Growth performance and carcass characteristics of two baconer pig genotypes on three dietary treatments MSc(Agric) dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-08022012-110745 / >

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