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Replicate differences were studied in lines of mice selected at 12 weeks of age for high (HF1, HF2) or low (LF1, LF2) right epididymal fat pad weight as a percentage of body weight (%EFP); for high (HL1, HL2) or low (LL1, LL2) hind carcass weight as a percentage of body weight (%HC); and randomly (RC1, RC2). Correlated traits were subcutaneous fat pad weight as a percentage of body weight (%SFP), water weight in hind carcass as a percentage of hind carcass weight (%WAT), body weights at 3, 6, and 12 weeks of age, and 3- to 6-week weight gain. Individual and maternal effects contributed to significant genetic drift for selected and correlated traits. No evidence indicated that drift was greater in selection treatments than in controls. Significant heterosis in replicate crosses within selection treatments was found for %HC in HL, LL, and LF and for %EFP in HF. Heterosis was insignificant in crosses of control replicates. Divergence in parental lines and replicate crosses was similar, indicating that differences in heterosis between high and low lines were small relative to divergence. Asymmetry tended to be greater between replicate crosses and parental lines, because selected replicates have greater average heterosis than control replicates. Multivariate discriminant function and Mahalanobis distance analysis of selected traits showed that divergence between replicates within selection treatments was much less than among selection treatments.
Replicate differences were studied in lines of mice selected at 12 weeks of age for high (HF1, HF2) or low (LF1, LF2) right epididymal fat pad weight as a percentage of body weight (%EFP); for high (HL1, HL2) or low (LL1, LL2) hind carcass weight as a percentage of body weight (%HC); and randomly (RC1, RC2). Correlated traits were subcutaneous fat pad weight as a percentage of body weight (%SFP), water weight in hind carcass as a percentage of hind carcass weight (%WAT), body weights at 3, 6, and 12 weeks of age, and 3- to 6-week weight gain. Individual and maternal effects contributed to significant genetic drift for selected and correlated traits. No evidence indicated that drift was greater in selection treatments than in controls. Significant heterosis in replicate crosses within selection treatments was found for %HC in HL, LL, and LF and for %EFP in HF. Heterosis was insignificant in crosses of control replicates. Divergence in parental lines and replicate crosses was similar, indicating that differences in heterosis between high and low lines were small relative to divergence. Asymmetry tended to be greater between replicate crosses and parental lines, because selected replicates have greater average heterosis than control replicates. Multivariate discriminant function and Mahalanobis distance analysis of selected traits showed that divergence between replicates within selection treatments was much less than among selection treatments.
Energy and nitrogen balances of mice receiving a dried skim milk-based control diet were compared to a similar group of mice receiving a diet containing 8% spray-dried plasma protein (SDPP). Mice were housed in pairs in metabolism cages with feed and water available for ad libitum intake. Five cages were assigned to each diet for a 21-d feeding period. Mice fed SDPP gained more weight (P < .01), consumed more feed (P < .01), and had higher gain: feed ratios (G:F) (P < .01) than mice fed the control diet during wk 1. No significant differences in growth, feed intake, or G:F were detected during wk 2. During wk 3, mice receiving the control diet tended to gain more (P < .10) and had a higher G:F (P < .01). Nitrogen intake and retention were greater for mice fed SDPP (P < .02). Energy intake was greater for mice fed SDPP (P < .01); however, energy retention was not different between treatment groups due to greater (P < .01) metabolic energy losses (urinary energy+heat production). Empty gut weight was greater for control mice on an absolute basis (P < .05) and when expressed as a percentage of BW (P < .02). Liver weights of mice fed SDPP were greater on an absolute basis (P < .02) and as a percentage of BW (P < .01). Feed intake, growth rate, and G:F were increased by dietary addition of SDPP.(ABSTRACT TRUNCATED AT 250 WORDS)
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