Tempel Genetics

Gentryville, IN, United States

Tempel Genetics

Gentryville, IN, United States
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Yoder C.L.,Iowa State University | Duttlinger V.M.,Tempel Genetics | Baas T.J.,Iowa State University
Journal of Animal Breeding and Genetics | Year: 2014

Summary: Daily feed intake during lactation was recorded in parity records from purebred Yorkshire (n = 1587), Landrace (n = 2197) and reciprocal cross F1 (n = 6932) females, and lactation feed intake (LFI) curves were predicted using a mixed model. Evaluation of the difference in feed intake between two consecutive days of lactation resulted in the following classifications: three periods for purebreds, days 1-6, days 7-10 and days 11-18, and two periods for F1 sows, days 1-5 and days 6-18. Average rate of change in intake (ARC), average daily intake (ADI) and variation from predicted LFI values (VAR) were computed for each period of lactation. Gibbs sampling was used to estimate genetic (co)variance components for LFI metrics and reproductive performance traits. Genetic variance estimates for each LFI metric were obtained with univariate animal models, and covariance estimates were estimated with bivariate models. Heritability estimates for ADI, ARC and VAR metrics computed over the duration of lactation were 0.37, 0.24, and 0.16, respectively. Heritability estimates were highly variable across periods of lactation for ARC (0.03-0.17), ADI (0.09-0.36) and VAR (0.04-0.18) metrics in purebred and F1 populations. Genetic correlations between LFI metrics and reproductive traits were relatively low, although LFI metrics later in lactation were more highly correlated with reproductive performance. © 2014 Blackwell Verlag GmbH.


Yoder C.L.,Iowa State University | Schwab C.R.,The Maschhoffs | Fix J.S.,National Swine Registry | Duttlinger V.M.,Tempel Genetics | Baas T.J.,Iowa State University
Livestock Science | Year: 2012

Daily feed intake during lactation was recorded on purebred Yorkshire (n=1587), Landrace (n=2197), and F1 Yorkshire x Landrace (n=6932) litters from day 1 to 22 of lactation. Lactation feed intake (LFI) curves were predicted using a mixed model which included fixed effects of breed, season, parity group (PG), day of lactation, interactions of day with breed and PG, and a covariate for litter size after cross-fostering. Random effects included litter, contemporary group (herd-year-month), dam, and sire nested within breed. Least squares means for each day were used to express LFI curves by breed through day 22 of lactation. Yorkshire and Landrace LFI curves were not different (P=0.09), though both differed from the LFI curve (P<0.05) of F1 sows. Due to a limited number of observations in late lactation, LFI data from days 19 to 22 were not included. Evaluation of the difference in feed intake between 2 consecutive days (DC) of lactation resulted in the following classifications: 3 periods for purebreds, day 1 to 6 (PB1), day 7 to 10 (PB2), and day 11 to 18 (PB3); 2 periods for F1 sows, day 1-5 (C1) and day 6-18 (C2). Average rate of change in intake (ARC), average daily intake (ADI), and variation from predicted LFI values (VAR) metrics were estimated for each period in purebred and F1 sows. Parity group 1 in both purebred and F1 sows had the lowest ARC and ADI metrics, but highest VAR (P<0.05) in each period of lactation. Similar differences were observed for seasonal effects (P<0.05) as LFI curves during summer months represented lower ARC and ADI and higher VAR values compared to all other seasons. For all breeds, increased ARC and ADI metrics resulted in higher 21-day litter weaning weights (P<0.05), while decreasing VAR metrics late in lactation (PB3 and C2) resulted in higher 21-day litter weaning weights and shorter wean-to-first service intervals (P<0.05). Average rate of change increased more quickly in early periods (PB1, PB2, C1) and was lower in late lactation (PB3, C2). An increase in average rate of change in intake, average daily intake, and decreased variation from predicted LFI values during a period of lactation resulted in improved measures of maternal performance. © 2012 Elsevier B.V.


Yoder C.L.,Iowa State University | Schwab C.R.,The Maschhoffs | Fix J.S.,National Swine Registry | Stalder K.J.,Iowa State University | And 3 more authors.
Livestock Science | Year: 2013

The objectives of this study were to quantify significant negative deviations (DEV) from predicted daily lactation feed intake values and to estimate their effect on reproductive performance and subsequent intake in purebred and F1 sows. Daily lactation feed intake (LFI) records from day 1 to 22 of lactation from purebred Yorkshire (n=1587 parity records), purebred Landrace (n=2197 parity records), and reciprocal cross F1 (n=6932 parity records) females were used to predict daily LFI values. The mixed model included fixed effects of breed, season, parity group (1, 2, 3 and ≥4), day of lactation, and interactions of day with breed and parity group, and a covariate of litter size after cross-fostering. Random effects included litter, contemporary group (herd-year-month), dam, and sire nested within breed. Deviations from predicted LFI values were quantified using an internally studentized residual (SR). A SR≤-1.71, equivalent to observed LFI at least 1.9. kg less than predicted, was considered a DEV. Zero DEV occurred in 60% of lactation records, while 18% of lactation records had 1 DEV, and 22% of lactation records had ≥2 DEV. Thirty-four percent of negative deviations occurred during the summer months (June, July, August) which was more frequent when compared to the spring (26%), fall (23%), and winter (17%) months. Adjusted 21-day litter weaning weight (LW21) decreased as the number of DEV increased within a single lactation period, and wean-to-first service interval (WTSI) increased when at least 3 DEV occurred within a single lactation. An increase in DEV during early lactation did not affect LW21 or WTSI (P>0.05), though an increase in number of DEV after day 5 of lactation was associated with lower LW21 and longer WTSI. Odds of a negative deviation from predicted LFI occurring on any given day of lactation were estimated as odds ratios. If a DEV occurred the prior day, a DEV was 8.7 and 39.5 times more likely to occur than if a DEV had not occurred for purebred and F1 sows, respectively. In F1 sows, a DEV was 3.1 (P<0.01) times more likely to occur after day 5 of lactation when a DEV occurred on day 1 to 5 of lactation. Negative deviations from predicted LFI values decreased reproductive performance and had a larger effect on performance when they occurred during late lactation. © 2013 Elsevier B.V.


Yoder C.L.,Iowa State University | Duttlinger V.M.,Tempel Genetics | Baas T.J.,Iowa State University
Journal of Animal Breeding and Genetics | Year: 2015

Days to reach 113.4 kg, adjusted backfat depth and adjusted loin muscle area to 113.4 kg were evaluated on pure-bred Landrace (n = 15 660) and Yorkshire (n = 14 808) boars and gilts. Daily lactation feed intake (LFI) was recorded within parity records from pure-bred Yorkshire (n = 1587) and Landrace (n = 2197) females during day 1-22 of lactation, and LFI curves were predicted using a mixed model. Evaluation of feed intake differences between 2 consecutive days of lactation resulted in the following periods: day 1-6 (PB1), day 7-10 (PB2) and day 11-18 (PB3). Average rate of change in intake (ARC), average daily intake (ADI) and variation from predicted daily LFI values (VAR) metrics were computed for each period of lactation. Gibbs sampling was used to estimate the genetic covariance between LFI metrics and grow-finish traits. Genetic correlations were strongest between grow-finish traits, and LFI metrics in first parity sows and were generally favourable, but correlations with LFI metrics during parity 2 or greater were low and not different from 0 (p > 0.05). Genetic correlations between LFI metrics in parity 1 sows with growth and composition traits varied greatly in strength and direction. Selection for leaner, heavier muscled gilts had a limited effect on LFI metrics. However, selection for increased growth rate was associated with higher ARC and ADI and smaller VAR values. © 2014 Blackwell Verlag GmbH.

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