Graduate Thesis Or Dissertation
 

Reproductive characteristics of two breeds of swine fed dichlorvos

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  • Thirty-six gilts were used in an experiment of 2³ factorial design. The experiment consisted of two breeds (Yorkshire- Berkshire and Yorkshire), two feeding regimens (pre-breeding and post-breeding) and two levels of dichlorvos (2, 2-dichlorovinyl dimethyl phosphate, 0 and 800 mg. per gilt per day). Pre-breeding treatment consisted of feeding dichlorvos to gilts for the duration of the estrous cycle prior to mating. Post-breeding treatment was initiated on the day of last mating and was continued until 48 hours prior to slaughter. All gilts were slaughtered on day 25 ± 1 of gestation. There was no effect of treatment or breed on number of corpora lutea, or number of viable embryos. Treatment of gilts with dichlorvos prior to breeding caused an increase in total and average luteal weight (P < .025, for each characteristic). Dichlorvos fed to gilts prior to breeding increased the number of ovarian follicles > 4 mm. diameter (P < .005) and follicular fluid weight (P < .025). Pre-breeding treatment caused a greater increase in follicle size in Yorkshire than in Yorkshire-Berkshire gilts (pre-breeding x breed interaction P < .025). The anterior pituitary was heavier in gilts of Yorkshire- Berkshire breeding than in Yorkshire gilts (P < .005) but the stalk median eminence tended to be heavier in Yorkshire gilts (P ≈ . 08).
  • Keywords: Dichlorovinyldimethyl phosphate
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Déclaration de droits
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