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برآورد اثر شمار سلولهای سوماتیک بر مقدار شیر روزانه در گامههای مختلف شیردهی گاوهای شیری حاصل از اسپرمهای داخلی و وارداتی | ||
پژوهش های علوم دامی (دانش کشاورزی) | ||
مقاله 8، دوره 28، شماره 1، خرداد 1397، صفحه 109-125 اصل مقاله (1.06 M) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
زینب اکبرپناه؛ همایون فرهنگفر* ؛ یاسمن شمشیرگران؛ محمّدرضا اصغری | ||
گروه علوم دام دانشگاه بیرجند | ||
چکیده | ||
زمینه مطالعاتی: ورم پستان، معمولترین و از لحاظ اقتصادی، مهمترین بیماری در صنعت پرورش گاو شیری است که منجر به کاهش تولید شیر، هزینههای درمانی، منع مصرف شیر در خلال درمان، تغییر در سلامت و کیفیّت ترکیبات شیر، کاهش زاد و ولد، مرگ و حذف زود هنگام میگردد. هدف: این تحقیق، با هدف برآورد اثر شمار سلولهای سوماتیک بر مقدار شیر روزانه در گامههای مختلف شیردهی گاوهای شیری شکم اول حاصل از اسپرمهای داخلی و وارداتی انجام شد. روش کار: تعداد 543884 رکورد روز آزمون متعلق به 64634 رأس گاو شیری شکم اول در 606 گله که طی سالهای 1388 الی 1392 (در ده استان) زایش داشتند، مورد استفاده قرار گرفت. صفت مورد بررسی، شیر روز آزمون بود. رکوردهای شیر روز آزمون، توسط یک مدل خطی آنالیز شدند. مدل مزبور، برای هر ماه بهطور جداگانه، بر رکوردهای شیر برازش داده شد. نتایج: بیشترین افت تولید شیر در گاوهای حاصل از اسپرم ایرانی، کانادایی و آمریکایی بهترتیب مربوط به فروردین ماه در گامهی شیردهی دهم (2430/0 کیلوگرم)، فروردین ماه در گامهی شیردهی دهم (3853/0 کیلوگرم) و اسفند ماه در گامهی شیردهی نهم (2305/0 کیلوگرم) بود. کمترین افت تولید شیر در گاوهای حاصل از اسپرم ایرانی، کانادایی و آمریکایی بهترتیب مربوط به دی ماه در گامهی شیردهی اول (0042/0 کیلوگرم)، آبان ماه در گامهی شیردهی نهم (0015/0 کیلوگرم) و مرداد ماه در گامهی شیردهی چهارم (0447/0 کیلوگرم) بود. نتیجهگیری نهایی: در گاوهای شیری حاصل از اسپرم ایرانی، آمریکایی، کانادایی، با افزایش شمار سلولهای سوماتیک تولید شیر کاهش مییابد و این کاهش تولید شیر ناشی از افزایش شمار سلولهای سوماتیک در ده گامهی شیردهی در ماههای مختلف سال، روند منظّمی ندارد. | ||
کلیدواژهها | ||
رکورد روز آزمون؛ شمار سلولهای سوماتیک؛ گامهی شیردهی؛ گاو شیری | ||
مراجع | ||
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