إستخدام قياسات الصبغين الجنسي كمؤشر انتخابي لصفة انتاج الحليب ومكوناته وطول موسم الحليب في الماعز المحلي
إستخدام قياسات الصبغين الجنسي كمؤشر انتخابي لصفة انتاج الحليب ومكوناته وطول موسم الحليب في الماعز المحلي
DOI:
https://doi.org/10.59658/jkas.v3i2.16Keywords:
الصبغين الجنسي, انتاج الحليب الكلي ومكوناته, طول موسم الحليب, الانحدار المتعدد, الماعز المحلي., Key words: Sex chromatin, total milk production and its components, length of lactation, coefficient of multiple regression, Local goats.Abstract
إستخدام قياسات الصبغين الجنسي كمؤشر انتخابي لصفة انتاج الحليب ومكوناته وطول موسم الحليب في الماعز المحلي
علي نجم عبدالله * وسن جاسم محمد**
دائرة البحوث الزراعية * جامعة بغداد / كلية الزراعة **
Email: naali127@yahoo.com
المستخلص
أجري البحث في محطة بحوث المجترات التابعة لدائرة البحوث الزراعية/ وزارة الزراعة, إذ أستخدمت 30 معزة محلية لغرض دراسة تأثير شكل وصفات الصبغين الجنسي في انتاج الحليب الكلي وطول موسم الحليب ونسب مكوناته في الماعز المحلي. تم سحب عينات الدم وتحضيرها وفحصها لتحديد شكل الصبغين الجنسي وقياساته في خلايا الدم (البيض العدلة) وعلاقتها بالصفات المدروسة, بينت النتائج مايأتي: بلغت النسبة المئوية لشكل الصبغين الجنسي من نوع عصا الطبال وبروز من دون ساق ودمعة العين والهراوي 75.65 و 16.10 و 5.21 و 3.04% بالتتابع. كما أظهرت النتائج أن هناك تأثير معنوي (0.05 >p ) لشكل الصبغين في انتاج الحليب الكلي وطول موسم الحليب, إذ تفوق الشكل الهراوي على بقية الأشكال تلاه عصا الطبال وبروز من دون ساق وأخيرا دمعة العين, في حين لم يكن هنالك تأثير معنوي لشكل الصبغين في نسب مكونات الحليب. كما تم استخراج معامل الانحدار المتعدد لدراسة العلاقة بين الصفات المدروسة والبعد العمودي والأفقي للصبغين وعدد الفصوص للنواة الحاملة للصبغين, فكان انحدار انتاج الحليب الكلي معنويا (0.05 >p ) على أبعاد الصبغين المدروسة, في حين كان انحدار طول الموسم عالي المعنوية ( 0.01 >p ) على أبعاد الصبغين, إذ انهما سينخفضان بزيادة البعد العمودي ويزدادان بزيادة البعد الأفقي وعدد الفصوص. أما بالنسبة لمكونات الحليب فلم يكن انحدارها معنويا على صفات الصبغين المدروسة, الاَ أن نسبة الدهن ستزداد بزيادة البعد العمودي وعدد الفصوص وتقل بزيادة البعد الأفقي, أما نسبة المواد الصلبة اللادهنية ستقل و نسبة البروتين ونسبة اللاكتوز فإنها ستزداد بزيادة البعد العمودي و وتقل بزيادة البعد الأفقي وعدد الفصوص.
الكلمات المفتاحية: الصبغين الجنسي, انتاج الحليب الكلي ومكوناته, طول موسم الحليب, الانحدار المتعدد, الماعز المحلي.
البحث مستل من رسالة ماجستير للباحث الأول.
Using of sex chromatin measurements as a selection indicator for milk production and its composition and length of lactation in local goats
Ali Najm Abdullah* Wasan Jassim Mohamed Al-Khazragi**
Office of Agricultural research *
University of Baghdad/ College of Agriculture* *
Abstract
This study was undertaken at the Ruminant's Research Station, Office of Agricultural Research / Ministry of Agriculture, 30 Local does were used in this study to study the effect of sex chromatin shape and its characteristics in some economic traits for goats, such as total milk production, length of lactation period and milk composition. Blood samples were taken, prepared and examined to determine sex chromatin shape and its measurements in Neutrophil and its relationship with studied traits. Results showed that the percentages of figures of sex chromatin types; drum stick (D), sessile nodule (SN), teardrop (T) and small club (SM) were 75.65, 16.10, 5.21 and 3.04 % respectively. In addition, there was a significant effect of Small Club shape (SM) in total milk production and length of lactation, whereas there was no significant effect for sex chromatin shapes in milk composition. Multiple regression coefficients were also extracted to examine the relationship between traits under study and measurements of sex chromatin, which were vertical and horizontal axes and a number of nucleus lobes. Results showed that the regression coefficient of total milk production was significant and length of lactation was highly significant with dimensions of sex chromatin and a number of lobes, where both traits will improve with increase of horizontal and number of lobes, while they will decline if vertical axes increase. Finally, percentages of milk composition will improve with increase of vertical axes, but they decrease when other dimensions increase except fat percentage which improve with increase of a number of lobes.
Key words: Sex chromatin, total milk production and its components, length of lactation, coefficient of multiple regression, Local goats.
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