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Register a new userLactation performance and milk composition in Syrian Shami cattle milked with and without presence of their calves
الأداء الإنتاجي و تركيب الحليب بوجود العجل أو بعدم وجوده في أثناء الحلابة الآلية في الأبقار الشامية
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Damascus University ورقة بحثية
Publication date
2006
fields
Animal Production
and research's language is
العربية
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Shamra Editor
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أجريت الدراسة في محطة بحوث دير الحجر للأبقار الشامية التابعة لإدارة بحوث الثروة الحيوانيـة. اِستُخدمت لهذا الغرض 12 بقرة في موسم حلابتها الأول من سلالة الأبقار الشامية لمعرفة تأثير طريقـة الحلابة في أداء الأبقار الإنتاجي و تركيب الحليب الناتج. قسمت الحيوانـات عـشوائياً إلـى مجمـوعتين متساويتين في العدد، اِستُخدمت عند أبقار المجموعة الأولى الحلابة الآلية بوجود عجولها بجانبهـا فـي أثناء الحلابة، في حين أُجريت عند أبقار المجموعة الثانية الحلابة الآلية دون وجود عجولها بجانبها. قُدر إنتاج الحليب اليومي أسبوعياً و من كل بقرة في كلتا المجموعتين و تم في الوقت نفسه أخذ عينات حليب لتقدير نسب مركبات الحليب الأساسية الدهن، البروتين، اللاكتوز، المادة الجافة، و ذلك حتى نهايـة موسم الحلابة. بعد جمع البيانات حللت في برنامج إحصائي SAS كتـصميم عـاملي لقياسـات متكـررة باستخدام تحليل التباين ANOVA) Model Mixed).
This study was conducted at the Deir Al-Hajar Shami Cattle Research Station, Animal Wealth Research Administration. For this purpose 12 primiparous Shami cows were used to know the influence of the milking regimes in the production performance of the cow and the composition of the produced milk. The animals were divided randomly into two equal groups. Machine milking were used at the first group in the presence of the calf, or for the machine milking without the presence of the calf at the second group. The daily production of milk was estimated weekly from every cow in both groups and at the same time milk samples were taken to estimate the percentage of the basic components of milk such as fat, protein, lactose and dry matter until the end of lactation. Data were analyzed in statistical program SAS by using variance analysis ANOVA (Mixed Model).
References used
Akers, R. and Lefcourt, A. (1982). Milking and suckling-induced secretion of oxytocin and prolactin in parturient dairy cows. Hormones and Behavior. 16, P: 87- 93
Bar-Peled, U.; Maltz, E.; Bruckental, I.; Folman, Y.; Kali, Y.; Gacitua, H.; Lehrer, A.R.; Knight, CH.; Robinzon, B.; Voet, H.; and Tagari, H. (1995). Relationship between frequent milking or suckling in early lactation and milk production of high producing dairy cows. J. Dairy Science. 78, P: 2726-2736
Bruckmaier, R. and Blum. J. (1998). Oxytocin release and milk removal in ruminants. J. Dairy Science. 81, P: 939- 949
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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 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.
Fifteen Shami cows available in Dier-Al-Hajar Station for improving Shami
Cattle were used during 2009-2010 to evaluate the ovarian response of cows for
gonadotropin releasing hormone (GnRH) or human chorionic gonadotropin
(hCG) injected on day 5
of the estrus cycle during which dominant follicle is
growing in the first follicular wave. Animals were divided randomly into three
groups of five cows. Group 1 was left as a control and received no treatment
while Groups 2 and 3 received on day 5 of the estrous cycle a single i.m.
injection of 8 ?g of a GnRH agonist (Buserelin) and 3000 IU hCG, respectively.
Transrectal ovarian ultrasonography was performed daily to monitor ovarian
follicular dynamics and corpus luteum.
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.
The study is based on the cost of milk and marketing margins in dairy
farms in Jordan and estimated cost function. This study is based on a cross
section data from 33 dairy farms. In the study it was determined that the cost of
raw milk production
in dairy farms is 0.43 JD/ Kg. and the most important cost
factors are feed cost, depreciation contributing 64%, 19%, respectively of total
production cost. It was found that marketing margins of milk were 77%,
econometric estimation of raw milk function using different forms showed that
the linear model is superior to the other forms. The elasticity of the estimated
cost function is found to be 0.20.
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