نتایج جستجو برای: projected minimum calving interval

تعداد نتایج: 391284  

2010
SYED MUHAMMAD SUHAIL MUHAMMAD SUBHAN QURESHI SARZAMIN KHAN

Inheritance of economic traits was studied in Nili-Ravi dairy buffaloes through analysis of data comprising 5037 records of daughters of 79 sires. Data were collected from three large-sized state dairy farms. Heritability, genetic and phenotypic correlations of some indicator traits on important production and reproduction traits were worked out. Based upon analysis of records for first lactati...

Journal: :علوم دامی ایران 0
سیده شادی قریشی دانشجوی کارشناسی ارشد دانشکده کشاورزی دانشگاه زابل محمد رکوعی استادیار دانشکده کشاورزی دانشگاه زابل مهدی سرگلزایی عضو هیئت علمی دانشگاه گوئلف کانادا احمد مقیمی اسفندآبادی مربی مرکز اصلاح‏نژاد دام کشور

birth weight (bw) is the first trait recorded fllowing birth. it can influence the performance of thecow and as well impact the performance of the calf it,s duringits maturity. to investigate the effect ofa calf,s bw on the performance of holstein dairy cattle in iran, the records gathered between 1967 and2010 were obtained from the iranian animal breeding center. the data were then used to mod...

Journal: :Acta biochimica Polonica 2013
Anna Trakovická Nina Moravčíková Radovan Kasarda

Leptin and leptin receptor genes are considered as production traits markers in dairy or beef cattle. The aim of this study was to verify the associations of polymorphisms in bovine LEP and LEPR genes with production and reproduction traits in Slovak Spotted and Pinzgau cows. Long-life production was evaluated: milk, protein, and fat yield and reproduction traits: age at first calving, calving ...

Journal: :Journal of animal science 2005
J L Martin R J Rasby D R Brink R U Lindquist D H Keisler S D Kachman

A 2-yr study using primiparous and multiparous, spring-calving, crossbred beef cows was conducted to evaluate the effects of supplemental whole corn germ on reproductive performance, calf performance, and serum leptin concentrations. Each year, cows were blocked by age and BCS and assigned randomly to one of three treatments: PRE (n = 115) cows received 1.14 kg/d (DM basis) of whole corn germ f...

Journal: :The Veterinary record 2008
R Jorritsma B Westerlaan M P R Bierma K Frankena

The milk yield and survival of 91 Holstein-Friesian dairy cows that had had a left-displaced abomasum (LDA) corrected laparoscopically were compared with those of 193 control cows matched for herd, parity and calving date. Ninety per cent of the LDA treatments were performed within four weeks after calving. The risk of being culled during the whole observational period of at least three years w...

2002
Gerben de Jong

In the Netherlands a fertility index is introducing which describes the fertility of daughters of a bull. The index is based on two breeding values which are estimated for all bulls; non return after 56 days (NR56) and interval between calving and first insemination (ICI). These two traits are combined in an index: the calving interval index or CI-index. This index was developed after comparing...

Journal: :The Veterinary quarterly 1996
G Opsomer P Mijten M Coryn A de Kruif

In modern high-yielding dairy herds fertility is of major economic importance. In order to gain maximum profit, calving intervals should not exceed 365 days. The achievement of a 365-day calving interval requires an early resumption of ovarian activity, an excellent oestrus detection, and a high first-service conception rate. Especially the inability to detect oestrus and to mate the cows by 60...

Journal: :Kansas Agricultural Experiment Station Research Reports 1973

Journal: :Journal of animal science 1988
D R Notter M H Johnson

Procedures for breeding value estimation for reproductive traits under pasture mating conditions were developed and tested using a computer simulation model of genetic control of bovine reproduction. The model generated annual calving rates (BCR) (0 or 1) and calving dates (CD) for each cow as a function of underlying genetic variation in two independent traits: single-service conception rate, ...

Journal: :Sustainable Agriculture Research 2021

The objective of the present work was to analyze evolution productive indicators over time in Nelore cows Bolivian tropics. period between 1991 and 2016, corresponding 3899 calvings were used for research which belong Technology Center on Agriculture Livestock Bolivia belonging (FUNDATION CETABOL) Cooperativa Agropecuaria Integral San Juan de Yapacaní used. Cows ordered by birth into...

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