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Register a new userCalving Interval and Factors Affecting it in Friesian Cattle Under Libyan Conditions
الفترة بين الولادتين و تأثير بعض العوامل فيها عند أبقار الفريزيان تحت الظروف اللِّيبية
1917
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Added by
Damascus University ورقة بحثية
Publication date
1996
fields
Animal Production
and research's language is
العربية
Created by
Shamra Editor
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بلغ المتوسط العام للفترة بين الولادتين ٤٢٥,٧ ± ١,٨٩ يومًا، و لفترة اللاحمل ١٤٦,٣ ± ١,٨٧ يوم، و لطول موسم الإدرار ٣٥٣,٩يوم ± ٠,٨٨ و لطول فترة التجفيف ٧٣,٠٧ ± ٠,٧٧ يوم، و ذلك على قطيع أبقار الفريزيان ( ٤٤٥ رأسًا) في محطة أبقار غوط السلطان في شرق الجماهيرية العربية الليبية. يستدلُّ من هذه المؤشرات أن القدرة التناسلية لهذه الأبقار تحت الظروف الليبية جيدة، مقارنة بأبقار السلالة نفسها في المناطق المدارية و شبه المدارية المشابهة، غير أن قيم هذه المؤشرات تبقى أقل من نظيراتها، عند أبقار الفريزيان في البلاد الأوروبية.
Records of ٤٤٥ Friesian cows were analysed for calving interval and its components; days open, lactation length and length of dry period. The model included parity, calving year and calving season. The overall means were ٤٢٥,٧٧ ± ١,٨٩, ١٤١,٣ ± ١,٣٧, ٣٥٣,٩ ± ٠,٨٨ and ٧٣,٠٢ ± ٠,٧٧ days for calving interval, days open, lactation length and length of the dry period respectively. These estimates are high by tropical and subtopical standards, but they remain lower than the reproductive performance of Friesian cattle in temperate countries.
References used
حداد، عيد عياة مشعاف ١٩٨١ دراسة مقارنة لإنتاجية الحليب والكفاءة التناسلية لأبقار الشرابيه والفريزيان المستورد تحت الظروف الشمالية من العراق. رسالة ماجستير، كلية الزراعة والغابات جامعة الموصل-العراق.
طاهر، كريم ناصر ١٩٨٥ بعض العوامل المؤثرة على أداء أبقار الفريزيان المستوردة في مشروع الدجيله. رسالة ماجستير، كلية الزراعة، جامعة بغداد، العراق.
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This research was conducted I during 2009-2010 at Dier Alhajar station,
General Commission for Scientific Agricultural Research to determine the
length of calving interval (CI) and the effect of sire, calving year, calving
season, parity and age o
f cow and their interactions in Shami Cattle.
It was concluded that CI can be reduced by better
management and providing good and suitable feeding conditions.
This study was conducted at Kharabo Dairy Station belongs to the Faculty
of agriculture, University of Damascus. 553 records for 206 Holstein Friesian
cattle were used to study factors affecting the calving interval during 1982 to
2007. Data were
exposed eccording to GLM, and analysis of variance was used
to determine the calving interval (CI) and the effect of calving year, calving
season, parity and interactions on the calving interval, and Duncan test was
used to compare means by SPSS program. The overall mean for (CI) was
459.12±4.90 days. and affected significantly (0.001>P) by calving year, but
there was no significant effect for calving season, parity and interactions
between studied factors on the calving interval. These results suggested that
better management, and applaying more efficient administration practices as
well as to improving the feeding status may reduce calving interval to typical
period of 365 days and increase reproductive and economic efficiency of dairy
cattle at Kharabo station.
This study was conducted at fedio dairy station belongs to the General organization
for cattle in Lattakia.. A total of 2534 production records of 1771 Holstein cattle were used
to study factors affecting the Days open (DO) during 1990 to 2013, and
to study the effects
of calving year, calving season, parity and interactions between studied factors on this trait.
Data were analyzed by the Least Square Means, and Duncan test was used to compare
means by SAS 9 program.
The overall mean for Days Open (DO) was 150.23 ± 1.44 days. and affected
significantly (P< .0..1) by calving year, calving season, parity and interaction (calving
year × calving season), (calving year × calving season) and (P<.0.5 ) by interaction
(calving year × calving season × parity) on the Days Open, but there was no significant
effect for interaction (calving year × parity).
Results suggested that better management, and improving the feeding status may
reduce Days Open to typical period (60 - 90 days), reduce interval calving, to get calf
every year, and increase reproductive and economic efficiency of dairy cattle at fedio
station.
This study conducted at Deir Al-Hajar Station during the season 2010-2011
to describe the lactation curve of Shami cattle and determine factors affecting
its shape compenents. 1120 records of 356 Shami cows collected between 1997 –
2010 were used.
Data were subjected to general linear model, and the analysis
of variance used to determine the effect of factors. Duncan test was used to
compare the means using SAS system (1996) and Incomplete gamma functions
were used to estimate the parameters of lactation curve (a, b and on the basis of
daily yield of milk.
Results indicated that the average values of the gamma parameters were
2.14 ± 0.01 kg for a (beginning of milking ), 0.61 ± 0.02 kg for b (increasing milk
production up to peak) and - 0.23± 0.01 kg for c (decreasing milk production
from peak to dry). The effect of calving year was significant (p<0.01) on a, and
(p<0.05) on b and (p<0.001) on c. The effect of age at calving and sex of calf was
significant (p<0.01) on a but non significant on b and c. Season of calving,
parity, and interaction between age and parity was not significant on all
parameters.
It was concluded that improving the productive performance of Shami
cattle, requires applying a long term genetic improvement program to select the
best herd.
This study was conducted at Kharabo dairy station belongs to the Faculty of
Agriculture، University of Damascus. 692 productive records for 269 Holstein
Friesian cattle were used to study the effects of calving year, age at first calving،
calving
season and parity on the adjusted 305-day milk yield. Data were
exposed to GLM, analysis of variance was applied to determine the effect of
studied factors and differences between averages were compared according to
Duncan test using SPPS 17. The overall mean for (305-d milk) was 6222.6 ±
62.01 kg. and affected significantly (P < 0.001) by calving year and parity and
(P<0.05) by age at first calving. No significant effect for season was observed.
Results suggested that better management practices and improving the feeding
status might help increasing the 305-d milk and making the status more
economic efficient in the dairy cattle at Kharabo Farm.
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