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Fat from sheep slaughtered at various intervals following treatment with dieldrin (1958) or with Y-BHC (1961) were examined for residues of these respective pesticides. From the results the approximate rates of diminution in residue during the weeks following the treatment are calculated. Results are also presented for the residue levels found in a limited survey of carcass fat taken from slaughter houses during 1962 in the normal course of marketing in England and Wales: in this survey the previous history of individual animals was carefully traced and comments on the residue levels found are related to this. IntroductionThis paper describes three studies, the first two being trials on sheep dipped with dieldrin and y-BHC, respectively, in order to ascertain the levels of these pesticides which in practice are likely to occur in the fat, together with information on the rate of decay of such residues. The third study took the form of a limited survey in which fat taken at slaughter-houses throughout England and Wales was examined for residues. In this latter study arrangements were made in advance to ensure that the dipping history and other pertinent information was available for each carcass, with the object (I) of comparing the results (and any conclusion which might be drawn from them) with the results and conclusions obtained in the dipping trials and, in particular, (2) of making a preliminary assessment of the residue pattern in slaughter-house meat. There was no experimental control of the dipping process in the survey.Together, the three studies have extended over a number of years, as indicated in the detailed account below. Many different individuals, from several organisations took part, the present account being drawn up by one of the participants.
Fat from sheep slaughtered at various intervals following treatment with dieldrin (1958) or with Y-BHC (1961) were examined for residues of these respective pesticides. From the results the approximate rates of diminution in residue during the weeks following the treatment are calculated. Results are also presented for the residue levels found in a limited survey of carcass fat taken from slaughter houses during 1962 in the normal course of marketing in England and Wales: in this survey the previous history of individual animals was carefully traced and comments on the residue levels found are related to this. IntroductionThis paper describes three studies, the first two being trials on sheep dipped with dieldrin and y-BHC, respectively, in order to ascertain the levels of these pesticides which in practice are likely to occur in the fat, together with information on the rate of decay of such residues. The third study took the form of a limited survey in which fat taken at slaughter-houses throughout England and Wales was examined for residues. In this latter study arrangements were made in advance to ensure that the dipping history and other pertinent information was available for each carcass, with the object (I) of comparing the results (and any conclusion which might be drawn from them) with the results and conclusions obtained in the dipping trials and, in particular, (2) of making a preliminary assessment of the residue pattern in slaughter-house meat. There was no experimental control of the dipping process in the survey.Together, the three studies have extended over a number of years, as indicated in the detailed account below. Many different individuals, from several organisations took part, the present account being drawn up by one of the participants.
Supona is a new organophosphorus compound which is highly effective for the control of maggot fly strike in sheep.Tissue samples taken from sheep which had been treated with various concentrations of Supona have been analysed for residues of Supona and the lipophilic metabolite trichloroacetophenone.As a result of treatment of sheep with concentrations of Supona at and above the intended field usage rate the following conclusions were drawn:(1) The Supona residues in the fat depots of sheep killed 7 days after dipping in double-strength dip(2) The residues in the major organs of these sheep were below the minimum detectable amount (3) The residues of trichloroacetophenone in the body fats and organs of sheep treated with Supona (4) The residues of Supona in the body fat of sheep dipped in normal strength Supona dipwash and ( 5 ) The residues of Supona were considerably lower and much less persistent than those occurring with wash never exceeded 0.1 ppm Supona and were in the main substantially below this level. (0.003 ppm).were below the minimum detectable amount (0.001 ppm).killed 3 days after treatment were less than 0.05 ppm.dieldrin when used at comparable concentrations.
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