فهرست مقالات breeding objective

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  1 - Defining Economic Values of Important Traits in One Hump Camel in Desert Areas Rearing System
  م. وطن خواه ع. شفیع نادری م.ر. مفیدی ع.ا. قره داغی م.ع. عباسی
  In this study production, reproduction, population, management and economic parameters resulted from recording of 7 flocks with size 57 to 400 and 721 heads of camels in a cycle of reproduction, during three years from 2011 to 2013 were used to find out of the economic چکیده کامل

  In this study production, reproduction, population, management and economic parameters resulted from recording of 7 flocks with size 57 to 400 and 721 heads of camels in a cycle of reproduction, during three years from 2011 to 2013 were used to find out of the economic values of important traits in one hump camel in desert areas rearing system. The economic traits that appeared in profit equation were durability, reproduction and production traits. The economic values, economic weights and the relative importance of traits estimated by increasing one unit and one genetic standard deviation of each trait, using maximizing profit, maximizing efficiency and minimizing cost situations. The results showed that from total annual revenue in each camel (294.10 US$), 66% accounted for sale of calf and 34% resulted from the sale of culling camels. The total annual cost in each camel (72.95 US$), feed, labour and management, facilities, drug and treatment and interest of investment accounted by 40.23%, 34.49%, 7.18%, 1.42% and 16.67%, respectively. The average annual profit and profit to cost ratio in each camel were equal to 221.15 US$ and 3.03, respectively. Relative importance of different group of traits for average of the herds were 58.44% for durability traits (survival rate in camel 14.31%, survival rate in calf to weaning age 34.74% and longevity of camel 9.39%), 24.33% for reproduction traits (conception rate 14.31%, calving interval -8.99%, and age at first calving -1.03%) and 17.23% for production traits (calf weaning weight 13.60%, weight of female replacement -1.09% and weight of camel 2.53%). Relative importance of durability traits resulted from maximizing efficiency and minimizing cost decrease steadily and added to the relative importance of reproduction and production traits. The estimated relative importance of different traits got in this study, could be used to form multiple trait selection indices to one hump camel breeding programs in desert areas rearing system. پرونده مقاله
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  2 - Breeding Objectives, Selection Criteria and Breeding Practices of Indigenous Goat Population in Ethiopia: A Review
  K. Tilahun S. Betsha A. Melesse
  Breeding objectives and selection criteria are the main component in small ruminant production and these parameters should be identified to formulate sustainable breeding programs. Farmers select breeding stock to be parents of the next generation by using various crite چکیده کامل

  Breeding objectives and selection criteria are the main component in small ruminant production and these parameters should be identified to formulate sustainable breeding programs. Farmers select breeding stock to be parents of the next generation by using various criteria in different agro ecologies and production systems. However, selection is practiced by livestock keepers without having knowledge of heritability of traits, repeatability and genetic and phenotypic correlation among traits. Selection is practiced by giving more emphasis for qualitative traits such as color and appearance, which are less relevant to production characters. Under smallholder subsistence production system, goats are mainly kept for multipurpose roles and there is no definite breeding goal. The objectives of keeping goats varied based on production system, socio economic factors, and cultural role. The breeding system that is dominantly practiced by farmers is uncontrolled mating which leads to mating of related animals that in turn may cause loss of fitness and reproductive traits due to the occurrence of inbreeding. The main factors that attributed to uncontrolled mating are the presence of communal grazing land, lack of awareness on the consequence of inbreeding, and lack of sufficient breeding bucks in the flocks. To improve the productivity of the indigenous goat population, farmers should identify the breeding objectives and breeding goal traits and selection should be practiced towards those identified traits based on the recorded performances. The objective of this review is thus to highlight the breeding objectives, selection criteria and breeding practices of indigenous goat types in a wide range production systems of Ethiopia by carefully reviewing recently available literature sources. پرونده مقاله
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  3 - Breeding Objectives and Desired-Gain Selection Index for Rayeni Cashmere Goat in Pasture System
  ن. کارگر برزی ا. آیت‌اللهی مهرجردی م.ع. عباسی
  The aim of this study was to define breeding goals and determine the suitable selection index in Rayeni cashmere goat using simulated data. To select animals for increased quantity of meat, milk and cashmere produced, body weight of the doe (BWD), milk weight (MW), cash چکیده کامل

  The aim of this study was to define breeding goals and determine the suitable selection index in Rayeni cashmere goat using simulated data. To select animals for increased quantity of meat, milk and cashmere produced, body weight of the doe (BWD), milk weight (MW), cashmere weight (CW), weight of kids for sale (WK) and number of kids for sale per doe (NK) was used as selection criteria. Four selection indices were proposed (I1–I4) to compare genetic gain for all traits included in indices based on selection index. Maximum of genetic gain was calculated for 0.04 buck ratio with the full selection index (I1). So, the most suitable selection index for this breed is index 1 which included BWD, MW, CW, WK and NK. پرونده مقاله