FACTORS AFFECTING ON AGE AT FIRST CALVING IN CROSSBRED CATTLE MAINTAINED AT LES QADIRABAD DISTRICT SAHIWAL
نویسندگان
چکیده
The data on age at first calving for 539 records of crossbred cows differentfilial/genetic groups were considered the present investigation. These crossbreds belonged to eightfilial/genetic (F1, F2, F3, F4, F5, F6, F7 and F8) maintained Livestock Experiment StationQadirabad District Sahiwal from 1991 2014 (24 years). duration 24 year was divided into 6periods (P1, P2, P3, P4, P5 P6) four years each. Each further threeseasons as winter (November-February), summer (March- June) spring (July-October) basisof geo-climatic conditions prevailing in region. overall population mean calvingwas determined 1261.88±9.934 days. analysis variance revealed significant effect period ofcalving calving. finding this study shows that subjected tonon-genetic factor. Effect season non- whichindicate breed characteristic adaptation with environment. Meanwhile filial/genetic groupwas Therefore, result investigation it can bedetermined improving feeding, health other husbandry practices are essential enhancethe performance trait herd.
منابع مشابه
Factors Affecting Age at First Calving in Kankrej Cattle
The data of 35 years from 1980 to 2014 were analyzed to study the effect of genetic and non-genetic factors viz. period of calving, season of calving as fixed effect and sire as random effect on the reproduction trait (age at first calving) of Kankrej cattle maintained at Livestock Research Station, S.D. Agricultural University, Sardarkrushinagar, Gujarat. The least square mean of age at first ...
متن کاملIdentifying factors affecting age at first semen freezing and age at first semen use in Sahiwal bulls
AIM The objective of the study was to evaluate the effects of non-genetic factors on reproduction traits viz. age at first semen freezing and age at first semen use of breeding bulls in Sahiwal bulls by fitting least-squares analysis. MATERIALS AND METHODS The information on reproduction traits of 43 Sahiwal breeding bulls belonging to 8 sets of Sahiwal breeding program at Indian Council of A...
متن کاملCalving day and age at first calving in Angus heifers.
Because of difficulties in data collection and analysis, in most breeds there have been limited ways to evaluate fertility in females on a between-herd basis. The objective of this study was to determine the heritabilities (direct and maternal) for CD (calving day) and AFC (age at first calving) in American Angus heifers and to evaluate the potential for using these traits in genetic improvemen...
متن کاملG enetic relationships between calving date, calving interval, age at first calving and type traits in beef cattle
In this paper the genetic relationships between major reproductive traits in beef cattle (Calving Date, Calving Interval and Age at First Calving) and type traits have been estimated to evaluate the usefulness of type classification in predicting reproductive performance in beef cattle. We estimated favourable genetic correlations between Calving Interval and type traits ranging from 2 0.027 to...
متن کاملEffect of age at first calving on longevity and fertility traits for Holstein cattle
Effects of age at first calving (AFC) on functional longevity of Czech Holstein cows and their reproduction traits in the first lactation were analyzed using the first lactation data of 605 538 Holstein cows first calved from 1993 to 2008. Three classes were formed for AFC: low age class (16–24 months), average age class (25–30 months), and high age class (33–46 months). Effects of AFC on lengt...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Pakistan journal of science
سال: 2023
ISSN: ['0030-9877', '2411-0930']
DOI: https://doi.org/10.57041/pjs.v74i3.780