S M el Kandelgy

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Regression analysis was used to evaluate the effects of gilt age and body composition at first breeding on sow performance over three parities. Eighty-seven Yorkshire x Landrace F1 gilts were used. Variation in age and body composition at first breeding was obtained by breeding gilts at puberty, second, or third estrus and by providing those gilts bred(More)
Thirty-seven pigs were used to evaluate the effects of age and weaning on the level of protease in the gastric mucosa and trypsin, chymotrypsin, amylase and lipase in the pancreas. There was a positive allometry of the pancreas and gastric mucosa associated with age and with weaning to a solid diet. Increases with age in total activity of chymotrypsin,(More)
An experiment using comparative slaughter was conducted to examine the relationship between occurrence of nutritionally induced anestrus in postpubertal gilts and chemically determined body composition and body composition changes. Thirty-nine Duroc x (Yorkshire x Landrace) gilts, each having experienced three or more estrous cycles, were used. Nine gilts(More)
The relationship between body composition and the occurrence of puberty was evaluated using 93 Yorkshire x Landrace gilts. At approximately 60 d of age gilts were purchased and placed in a heated confinement unit where they were housed for the duration of the study. Ad libitum access to feed was provided throughout the study. Gilts were moved, mixed, and(More)
Pietrain swine homozygous for the hal gene (n) associated with porcine stress syndrome (PSS) and a Pietrain-derivative breed, Near Pietrain (NP), with a frequency of .31 for n, were mated to produce reciprocal F1, F2, and purebred NP litters. The halothane challenge test was performed on all 40 parents and 240 progeny to predict their hal genotype and PSS(More)
Thirty-seven Duroc x (Yorkshire x Landrace) (DYL) and 21 Yorkshire x Landrace (YL) gilts were used to develop equations that predict body composition of replacement-age breeding swine. Before slaughter, gilts were weighed, ultrasonically scanned for 10th rib backfat thickness, and infused with D2O (.25 g/kg live weight). The D2O space (kilograms) was(More)
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