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Register a new userStudy the Discarding factors in friesien cattle and its effect on the milk production of jeb Ramlah dairy cattle
دراسة أسباب الاستبعاد في أبقار الفريزيان و أثره على إنتاج الحليب في مبقرة جب رملة
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أجريت هذه الدراسة في محطة أبقار جب رملة التابعة للمؤسسة العامة للمباقر على سجلات 546 بقرة حلوب خلال الفترة ما بين عامي 2004-2007 و التي استبعدت لأسباب عديدة و بأعمار مختلفة حيث ترواح العمر عند الاستبعاد بين 3-6 سنوات, و تراوحت نسب الاستبعاد لهذه الأبقار بين 20-25%. و قد كانت نسبة الاستبعاد مرتفعة في الموسم الأول إذ وصلت حتى 27.43% للسنوات 2004-2005 و 24.45% للسنوات 2006-2007.
This study was done on the records of 564 milk cows during the period 2004-2007 .Those cows were dismissed for many reasons and in different ages. The range of dismissing age is between 3-6 years. The ratio of dismissing of those cows was between 20-25% . The rate of dismissing was high in the first lactation season . It reached 27,43% for the years 2004-2005, and 24,45% for the years 2006-2007. The highest percentage of dismissing was in the first month of milk seasons .It reached 34,49% in the years 2006-2007.
References used
Grohn ,y ; Eieker, S ; Durocg , V ; and Hertl, J : (1998) :Effect of diseases on the culling of Holstein dairy cows in new york state . J . Dairy sci – 81: 966 – 978
Ivanek ,J ; Dolezal, p : ( 2001 ) : odbor evropske integrace Mze cr . sance a rizika se kterou hoveziho masa C . R . Z . Europske unii. potrivinarsky zpravodaj – 3 / 2001
(Kvaplik , J ; Zdene, K. R; Pavel , B ; and kolektiv . ( 2008 ): Pricni brakace skotu v czech republic. Zivocine vyroba.praha. 5.P (30-71
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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.
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.
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.
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 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.
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