The Evaluation of the Performance of Holstein –Friesian Cows in the Gezira Dairy Production and Processing Project

الموضوعات

زراعة

الملخص

The objective of this study was to evaluate the reproductive and productive performance of the pure Holstein-Friesian herd (imported dams and locally-born daughters) of the Arab Company for Agricultural Production and Processing under the prevailing management and environment during the period 1984- 1995 at El Bagair area in the northern region of the Gezira. In this study 3308 lactation records of 1367 Holstein-Friesian cows (668 imported and 669 farm-born) collected over the years 1984- 1995 were investigated. The data were classified according to the following criteria:1.Whether the cow was imported or farm-born.2.Year of calving3.Season of calving - Three seasons were identified: dry summer (March-June), wet summer (July - October) and winter (November -February).4.Lactation numberSix reproductive and productive traits were calculated from the data. These include:1.Number of services per conception (NSPC).2.Service Period (SP).3.Calving Interval (C.I)4.Lactation Yield (L. Y)5.Lactation Length(L.L.)6.Dry Period (D.P.)The data were analysed by the method of least squares means. They were subjected to analysis of variance using SPSS version 9 statistical package.The overall mean number of services per conception was 1.92±1.97. This trait was significantly affected by year and season of calving (p<0.01), but not by lactation number or type of cow (imported or farm-born). The overall mean of service period was 155.75±1.89 days, being highly significantly (P<0.001) affected by lactation number and year of calving, but not by season or type of cow. Lactation length showed an overall mean of 254.2±1.34 days. It was highly (P <0.001) affected by parity, year and season of calving, but not by type of cow. The lactation yield showed an overall mean of 2828.42±22.38 liters. Lactation number, year of calving and type of cow significantly affected (P<0.001) this trait. The season of calving did not influence this trait significantly. The overall mean length of the dry period was 208.88±27.02 days. It was not affected by any of the four factors studied (lactation number, type of cow, year or season of calving). The calving interval showed an overall mean length of 432.33±2.23 days. It was significantly affected by lactation number and year of calving (P<0. 0 I). The type of cow and season of calving exerted a weak influence on this trait.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0ef21a3b-5cdb-40df-972f-6551c027cd9b

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1621651_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Abd El Moneim Mukhtar Abu Nikhaila","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Ismail Mohamed El Fageir, El Gabouri","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

The Evaluation of the Performance of Holstein –Friesian Cows in the Gezira Dairy Production and Processing Project

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Abd El Moneim Mukhtar Abu Nikhaila

الإعداد

Ismail Mohamed El Fageir, El Gabouri

الاقتباسات الببليوغرافية