Reproductive Performance Evaluation of Holstein Friesian and Their Crosses with Boran Cattle Breeds in Ardaita Agricultural Technical Vocational Education Training College Dairy Farm, Oromia Region, Ethiopia
محورهای موضوعی : Camel
د.و. منجیستو
1
,
ک.آ. وندیمججن
2
,
م.اچ دمیساش
3
1 - Department of Animal Science, Selale University, Selale, Ethiopia
2 - Department of Animal Production and Technology, Bahirdar University, Bahirdar, Ethiopia
3 - Department of Animal Production and Technology, Bahirdar University, Bahirdar, Ethiopia
کلید واژه: reproductive performance, crossbred, Ardaita, Holstein Friesian,
چکیده مقاله :
The study was conducted at Ardaita Agricultural Technical Vocational Education Training (ATVET) college dairy farm, to evaluate the reproductive performance of Holstein Friesian and its crosses with Boran cattle breeds. Data collected between 2000 and 2015 on reproductive traits (n=2632) were studied and analyzed using general linear model procedure. The overall estimated means for age at first service (AFS), age at first calving (AFC), calving interval (CI), days open (DO) and number of services per conception (NSC) were: 31.33 ± 0.44 months, 41.08 ± 0.44 months, 405.50 ± 3.32 days, 134.84 ± 3.51 days and 1.36 ± 0.03, respectively. Except age at first service, which is influenced by level of Holestien Friesian percentage, season of calving and level of Holestien Friesian percentage was not significant (P>0.05) on all reproductive traits. The traits calving interval and days open significantly (P<0.001) influenced by year of calving and parity. Season of birth (P<0.05) and year of birth (P<0.001) significantly influenced age at first service and age at first calving. Service per conception was significantly influenced by year of calving (P<0.001) only. Except number of service per conception, the result obtained for age at first service, age at first calving, days open and calving interval of Holstein Friesian and its crosses with Boran cows in the study area were below the standards set for commercial dairy farms. Therefore, consideration should be given to the farm to improve those genetic and non-genetic factors affected performance.
این مطالعه در مزرعه پرورش گاو شیری هنرستان کشاورزی آردایتا (ATVET) و با هدف ارزیابی عملکرد تولیدمثلی هلشتاین فریزین و آمیختههای آن با گاو نژاد بُران صورت گرفته است. دادههای جمعآوری شده بین سالهای 2000 تا 2015 روی صفات تولیدمثلی (2632=n) با استفاده از روش مدل خطی عمومی آنالیز شده و مورد مطالعه قرار گرفتند. میانگینهای برآورد شده کلی برای سن نخستین آمیزش (AFS)، سن نخستین زایش (AFC)، فاصله زایش (CI)، روزهای باز (DO) و تعداد آمیزش به ازای هر آبستنی (NSC) به ترتیب برابر با 44/0 ± 33/31 ماه، 44/0 ± 08/41 ماه، 32/3 ± 50/405 روز، 51/3 ± 84/134 روز و 03/0 ± 36/1 بوده است. به استثنای سن نخستین آمیزش که تحت تأثیر درصد سهم ژنی هلشتاین فریزین قرار دارد، فصل زایش و درصد سهم ژنی هلشتاین فریزین بر سایر صفات تولیدمثلی تأثیر معنیداری نداشتند (05/0<P). تأثیر سال زایش و نوبت زایش بر صفات فاصله گوسالهزایی و روزهای باز معنیدار بوده است (001/0>P). فصل تولد (05/0>P) و سال تولد (001/0>P) تأثیر معنیداری بر سن نخستین آمیزش و سن نخستین زایش داشتند. سال زایش بر تعداد آمیزش به ازای هر آبستنی تأثیر معنیداری داشت (001/0>P). به غیر از تعداد آمیزش به ازای هر آبستنی، نتایج حاصل از سن نخستین آبستنی، سن نخستین زایش، روزهای باز و فاصله زایش هلشتاین فریزین و آمیختههای آن با گاوهای بُران در منطقه مورد مطالعه پایینتر از مجموعه استانداردهای مزارع پرورش گاو شیری تجاری بوده است. بنابراین از نتایج این تحقیق بایستی در بهبود عوامل ژنتیکی و غیرژنتیکی مؤثر بر عملکرد این مزرعه پرورشی استفاده گردد.
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