The research was conducted on 24 ewes of Awasi sheep. The
animal study were divided into 4 groups each includes six ewes.
The first three groups were injected via variant proportions of
BST hormone ( as serial doses 40 mg, 80 mg, and 120 mg)
dail
y for 2 weeks. The fourth group was considered as control
group. It was measured the quantity of morning milk and
measurement of fat and protein and lactose one time every
week. Tissue specimen was taken from udder to study the
changes of secretive vesicles.
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.
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.
A research had been made in three areas at the Syrian Cost where Al Awassi race is
grown; these areas are (Arab Al Mulk, Dwer Al Khateeb, Bekhdarmow). The number of
Al Awassi there reaches to (439) heads. The research was started at 2/11/2009, and
a
random sample of (82)was selected from each area (33-27-22) in a row, and measured
were at the day number (30-90-150) during the season milking, and completed at 4/3/2010.
Results showed at the second phase of day (90) a high measurements of udder which
meets the maximum standards of milk production, and the udder specification had a
significant impact on all forms of the mammary gland (20,01), as well as the nipple
specification, order of milking season, and age had impact on the nipple's size (20,01), but
not on the length of it, but the season milking and age had effect on udder height above the
ground (20,001).
Results showed a correlation which is not fixed between the udder specifications and
quantity of milk as well as a weak and positive relationship between the amount of milk
and nipple measurements in the order of (r=0.33, r=0.49, r=0.19, r=0.27).
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.
أدى استخدام عرق الهولشتاين فريزيان بشكل واسع في أعمال الخلط التربوي و الإنتاجي مع تحسين
العوامل البيئية إلى تحسين إنتاجية الأبقار من الحليب، إلا إنه قد سجل مع هذا التطور في إنتاج الحليـب
ازدياد في حالات أمراض التهاب الضرع Mastitis ، و قد أشارت المر
اجع العلمية في هذا السياق إلـى أن
الإصابة بأمراض التهاب الضرع يزداد احتماله مع ارتفاع إنتاجية الأبقـار مـن الحليـب، كمـا سـجلت اختلافات بين سلالات أو عروق الحليب بالنسبة لهذا المرض.
This study was carried out using white German goat race during 2000-2001
at the Research Center of Animal Production Division, Humboldt University,
Berlin, in order to examine the validity of the Lactocorder instrument, which
has been used for det
ermination of milking curve of cows, to determine the
milking curve of goat, and to study the timing changes of this curve.
Milk production and composition were studied on (٣٠) yearlings of
improved Awassi sheep during their first lactation, from ١٩٩٧ to ١٩٩٨ at the
Faculty of Agriculture, Damascus University.
At the beginning of experiment the animals were ١٤ to ١٦,٥ months old and
their body weight was ٤١,٥ kg.
