کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8874959 1623206 2018 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The economic value of replacement breeding ewes attaining puberty within their first year of life on New Zealand sheep farms
ترجمه فارسی عنوان
ارزش اقتصادی مورچه های جایگزین برای رسیدن به بلوغ در اولین سال زندگی خود را در مزارع گوسفند
کلمات کلیدی
گوسفند، پرورش گاو بلوغ بره راندمان تولید مثل، ارزش اقتصادی، مدل سازی سیستم مزرعه،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
چکیده انگلیسی
The economic value of increasing the reproductive performance of a breeding-ewe flock through selecting replacement ewes that attain puberty (AP) in their first year of life was quantified using bio-economic farm system modelling. In all of the scenarios modelled, the breeding-ewes were first presented for mating as yearlings (18-19 months of age) to enable them to start lambing at 2 years of age. For a New Zealand hill country sheep farm initially weaning 1.4 lambs per ewe mated, farm profit was improved by 6% when the percentage of breeding ewes that attained puberty in their first year of life was increased from 25% to 100%. However, if current sheep-industry target liveweight recommendations for rearing ewe lambs are met then between 70 and 95% of breeding-ewes should already attain puberty in their first year of life, and under these circumstances any further gains in farm profitability through specifically using this selection policy will be small (<2%). Countering the reproductive performance benefits of this selection policy was: (1) ewe liveweight increased with a higher AP%, which increased the individual feed requirements of the ewes; and (2) ewe mortality increased as multiple-bearing ewes became increasingly prevalent. The economic cost of using additional resources to further increase the farm's feed supply outweighed the benefits, resulting in the need to reduce farm breeding ewe numbers. The methodology and farm system model used for this study can be readily applied to other sheep farming systems. This can identify components of the reproductive process which should be targeted for further research to maximise on-farm benefits, and provide information on how a farm system will need to change for this to be successfully achieved.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural Systems - Volume 164, July 2018, Pages 38-46
نویسندگان
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