Multiple trait model combining random regressions for daily feed
intake with single measured performance traits of�growing pigs

Schnyder, U. W.; Höfer, Andreas; Labroue, F.; K�nzi, Niklaus

doi:10.1051/gse:2001004

Cited by 6 publications

(9 citation statements)

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“…In farm animals, average daily feed intake is typically recorded during each day of a long testing period, in some cases over the whole production time (e.g., in pigs). For instance, the testing period has been 35-100 days for pigs [33,35], 70-119 days for cattle [1,2], 42-56 for lambs [4,11,37], and 23-182 days for chicken [5,34]. In comparison, in the present study feed intake was recorded at each age only during three days, yet over a 21-day testing period.…”

Section: Recording Feed Intakementioning

confidence: 77%

Recording strategies and selection potential of feed intake measured using the X-ray method in rainbow trout

Kause¹,

Tobin²,

Dobly³

et al. 2006

Genet. Sel. Evol.

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This study examines the way long-term feed intake should be recorded accurately for selective breeding purposes, and estimates selection potential in feed intake using the X-ray method to record individual daily feed intake in rainbow trout (Oncorhynchus mykiss). The analysis showed that the point estimates of daily feed intake displayed low repeatabilities (r = 0.09–0.32). This indicates that a minimum of three repeated records were needed to accurately record average feed intake at a fixed age. To effectively breed for feed intake over the whole growing period, it is necessary to determine average feed intake at different ages, since there were only moderate phenotypic and genetic correlations between average daily feed intake recorded at 140 g, 750 g and 2000 g wet mass. Heritability for average daily feed intake was low (average h2 = 0.10), indicating that modest genetic changes can be obtained in response to selection. It was concluded that selection to genetically change long-term feed intake can be successful, yet repeated observations at several life stages are needed to ensure the accuracy of feed intake estimates and the efficiency of selection.

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Section: Recording Feed Intakementioning

confidence: 77%

Recording strategies and selection potential of feed intake measured using the X-ray method in rainbow trout

Kause¹,

Tobin²,

Dobly³

et al. 2006

Genet. Sel. Evol.

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“…2001; McPhee et al. 2001), while estimates for daily gain during the fattening period (from around 30 to about 100 kg) were generally higher with 35–45% (Schnyder et al. 2002; Gilbert et al.…”

Section: Resultsmentioning

confidence: 99%

Use of serial pig body weights for genetic evaluation of daily gain

Zumbach

Misztal

Chen

et al. 2010

J Animal Breeding Genetics

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This study examined the utility of serial weights from FIRE (Feed Intake Recording Equipment, Osborne Industries, Inc., Osborne, KS, USA) stations for an analysis of daily gain. Data included 884 132 body weight records from 3888 purebred Duroc pigs. Pigs entered the feeder station at age 77-149 days and left at age 95-184 days. A substantial number of records were abnormal, showing body weight close to 0 or up to twice the average weight. Plots of body weights for some animals indicated two parallel growth curves. Initial editing used a robust regression, which was a two-step procedure. In the first step, a quadratic growth curve was estimated assuming small or 0 weights for points far away from the curve; the process is iterative. In the second step, weights more than 1.5 SD from the estimated growth curve were treated as outliers. The retained body weight records (607,597) were averaged to create average daily weight (170,443) and then used to calculate daily gains (152,636). Additional editing steps included retaining only animals with >or=50 body weight records and SD of the daily gain

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“…Results do not indicate the existence of variation between sires for parameter estimates. Schnyder et al (2000) estimated heritabilities for polynomial feed intake curve parameters of 0.29 (intercept), 0.05 (linear regression), and 0.06 (quadratic regression).…”

Section: Resultsmentioning

confidence: 99%

Feeding time and feeding rate and its relationship with feed intake, feed efficiency, growth rate, and rate of fat deposition in growing Duroc barrows1

Rauw

Soler

Tibau

et al. 2006

Journal of Animal Science

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Because feed is the major cost to pork production, management practices and breeding strategies are aimed at optimizing feed intake. Knowledge about the shape of feed intake and feeding behavior curves may be of interest for optimization of lean meat production. This study investigated trends based on daily measurements of feeding behavior in 200 Duroc barrows, originating from 5 sires and 200 dams, during growth. Daily values were examined between 88 and 188 d of age. Furthermore, phenotypic correlations between feeding length and feeding rate, and feeding frequency, feed intake, residual feed intake, growth rate, and rate of fat deposition were investigated for a period between 95 and 175 d of age. No differences were observed between sires for parameter estimates of a curvilinear function fitted to data on feeding length as a function of age, but the effect of sire was significant (P < 0.01) for values at individual ages up to 132 d of age. Feeding rate (feed ingested for each minute spent eating) increased in a linear fashion with age (average R(2) = 0.80) and differently so for different sires (P < 0.05 for the intercept and P < 0.01 for the regression coefficient). Because the increase in BW is linear over this time period (average R(2) = 0.99), the results suggest that feeding rate increased with increased BW and is related to the physical capacity for feed intake. Results indicate that pigs that ate faster also ate more (r = 0.29, P < 0.001), grew faster (r = 0.40, P < 0.001), and grew fatter (r = 0.28, P < 0.001), but had no greater or lower residual feed intake (r = -0.01). The linear regression slope of feeding rate on age seemed inherent to the individual and was correlated with feed intake but not with residual feed intake. Feeding length may be selected for in order to regulate absolute feed intake at different stages of growth.

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Multiple trait model combining random regressions for daily feed intake with single measured performance traits of�growing pigs

Cited by 6 publications

References 0 publications

Recording strategies and selection potential of feed intake measured using the X-ray method in rainbow trout

Recording strategies and selection potential of feed intake measured using the X-ray method in rainbow trout

Use of serial pig body weights for genetic evaluation of daily gain

Feeding time and feeding rate and its relationship with feed intake, feed efficiency, growth rate, and rate of fat deposition in growing Duroc barrows1

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