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Register a new userCalving interval and affecting factors in Shami cattle
الفترة بين الولادتين في الأبقار الشامية و العوامل المؤثرة فيها
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نفذ البحث خلال عامي 2009 و 2010 ،المرباة في محطة بحوث دير الحجر، التابعة للهيئة العامـة للبحوث العلمية الزراعية لتحديد طول الفترة بين الولادتين في الأبقار الشامية و تأثير الأب، و سنة الولادة، و فصل الولادة، و الموسم الإنتاجي، و عمر البقرة عند الولادة، و تآثرها. استنتج أن التخفيف من أثر الظروف البيئية السائدة، و تأمين كميات كافية و النوعيات المناسبة مـن الأعلاف على مدار العام، و الاستقرار في إدارة القطيع يساعد في تقصير الفترة بـين الـولادتين و زيـادة الكفاءة الإنتاجية و التناسلية للأبقار الشامية في تلك المحطة.
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 of 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.
References used
Abdel Gader, A. Z., M. K. A. Ahmed, L. M. A. Musa and K. J. Peters. 2007. Milk yield and reproductive performance of Friesian cows under Sudan tropical conditions. Arch. Tierz. Dummerstorf. 50(2): 155-164
Ahmad, M. 1999. Genetic evaluation of native and crossbred dairy cattle in Pakistan. PhD Thesis, New England Univ., Australia
Al-Najjar, K. A. 1997. Genetic improvement in dairy cattle. M. Sc. Thesis, Fac. Agric, Ain shams Univ., Cairo,Egypt
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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 ± ١,٣
٧, 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.
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 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.
The present study was prepared to assess the level of
potassium in the vitreous humor fluid, to calculate the post mortem
interval (PMI) by finding the regression equation and to study the
effects of environmental factors like temperature and humidity and
age and sex on it.
The design of milking spaces, which are called Mahlab, is considered as the main factor for many
experts in agricultural engineering and animal production. The main aim is to determine the optimum
parlour milking with highest production and little
stress, whereas the parlour milking is considered as the
most important design factor in the barn because it is Influences getting the milk in cattle productivity
farms.
According to the importance of milk production, which effects on the local production and economy, this
paper treats with the most effective factors in the design of parlour milking in cattle farms, in order to be
suitable for dairy cattle production by considering its numbers, its movement and its suitable space. So,
this reflects its impacts on the level of production, in addition it shows the most important type of parlour
milking in the world that reflects the advantages and disadvantages that determine the type and size of
required parlour milking and its location and relationship with the cattle barn.
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