Calving traits

The genetic determinism of the calving and suckling performance of beef cows is little known whereas these maternal traits are of major economic importance in beef cattle production systems. This paper aims to identify QTL regions and candidate genes that affect maternal performance traits in the Blonde d’Aquitaine breed.

13p vinarcissa 21-03-2023 4 1   Download

Female fertility is an important trait in cattle breeding programs. In the Nordic countries selection is based on a fertility index (FTI). The fertility index is a weighted combination of four female fertility traits estimated breeding values for number of inseminations per conception (AIS), 56-day non-return rate (NRR), number of days from first to last insemination (IFL), and number of days between calving and first insemination (ICF).

9p vinarcissa 21-03-2023 6 1   Download

Understanding the underlying pleiotropic relationships among quantitative traits is necessary in order to predict correlated responses to artificial selection. The availability of large-scale next-generation sequence data in cattle has provided an opportunity to examine whether pleiotropy is responsible for overlapping QTL in multiple economic traits.

12p vinarcissa 21-03-2023 5 1   Download

The Nordic Red Cattle (NRC) consists of animls belonging to the Danish Red, Finnish Ayrshire, and Swedish Red breeds. Compared to the Holstein breed, NRC animals are smaller, have a shorter calving interval, lower mastitis incidence and lower rates of stillborn calves, however they produce less milk, fat and protein.

11p vinarcissa 21-03-2023 2 1   Download

Metabolic profile evaluation is a tool widely used in ruminant nutrition as metabolic cues that relate nutrition to physiology. Metabolic and hormonal traits change during pre-partum and lactation according to parity in dairy cows, but studies of beef cows under grazing are scarce.

15p vidarwin 22-02-2022 14 1   Download

The detection of quantitative trait loci has accelerated with recent developments in genomics. The introduction of genomic selection in combination with sequencing efforts has made a large amount of genotypic data available. Functional traits such as fertility and calving traits have been included in routine genomic estimation of breeding values making large quantities of phenotypic data available for these traits. This data was used to investigate the genetics underlying fertility and calving traits and to identify potentially causative genomic regions and variants.

13p vilarryellison 29-10-2021 7 0   Download

Animal health and welfare are at the forefront of public concern and the agricultural sector is responding by prioritising the selection of welfare-relevant traits in their breeding schemes.

14p vilichoo2711 25-06-2021 18 1   Download

The present study on Murrah buffaloes was conducted at Cattle and Buffalo Farm (Livestock Production and Management Section), ICAR-Indian Veterinary Research Institute. Reproductive data pertaining to post partum interval to estrus (PPIE), service period (SP), number of services per conception (NoS/C) and breeding efficiency (BE) were recorded and analysed to examine the effects of pre-partum body condition score, lactation order, age at calving, season of calving, body weight at calving and dry period on various reproductive traits.

7p chauchaungayxua11 23-03-2021 15 2   Download

he present investigation was conducted to study the effect of various non genetic factors like farm, parity, period of calving and season of calving on different production traits like total lactation milk yield (TLMY), 305 day milk yield (305MY), peak yield (PY), milk yield per day of lactation length (MY/LL) and milk yield per day of calving interval (MY/CI) in Murrah buffaloes. The data analysed include records of 2959 buffaloes, progeny of 219 sires maintained over a period of 24 years (1992-2015) at Buffalo research centre (BRC), LUVAS, Hisar and Animal farm ICAR-CIRB, Hisar.

8p trinhthamhodang1218 26-02-2021 11 2   Download

The present study was conducted on 308 Sahiwal cows sired by 38 bulls spared over a period of 32 years (1981- 2012), maintained at instructional dairy farm and AICRP on cattle -Sahiwal (field unit) at G.B.P.U.A. & T., Pantnagar Uttarakhand and Chak Ganjaria Government Cattle Farm Lucknow, Uttar Pradesh.

5p trinhthamhodang1216 19-11-2020 7 2   Download

Dietary nutrients not only affect productive and reproductive performance but also milk composition traits like milk protein and milk lactose. This study was conducted to observe effect of copper and zinc feeding on milk protein and milk lactose when these are fed in pre and post partum stage to kankrej cows. Twenty Kankrej pregnant cows (five in each group) at 30 days before the expected date of calving were used to present study and grouped into four groups (five in each group) as control, copper supplemented, zinc supplemented and supplemented with both elements.

8p quenchua6 15-06-2020 12 1   Download

The research data spread over a period of 41 years (1974 to 2015) were utilized to study the heritability, genetic and phenotypic correlation of life time performance traits. The mixed model analysing using LSML were used for estimation of variance components considering sire as a random effect, season and period of birth and age at first calving groups as fixed effects. Period of birth was highly significant on LTMY3, LTMY4, ALTMY, HL and PL whereas non-significant on BE. Season of birth did not influence any of the trait considered in the study.

7p nguaconbaynhay3 07-02-2020 36 0   Download

The present investigation was conducted on records of 2959 buffaloes, progeny of 219 sires over a period of 24 years(1992-2015) maintained at Buffalo research centre(BRC), LUVAS, Hisar and Animal farm ICAR-CIRB, Hisar, Four sire evaluation procedures such as ordinary least squares (OLS), regressed least squares (RLS), Derivative free restricted estimated maximum likelihood (DFREML) and best linear unbiased prediction (BLUP) based on estimated breeding value of performance traits such as first lactation milk yield (FLY), first lactation peak yield (FPY), first lactation milk yield per day of...

8p cothumenhmong1 08-12-2019 15 1   Download

The present study was conducted on 91 Tharparkar cows maintained at the Livestock Research Station, Beechwal, Bikaner for 11 years i.e. from 2006 to 2016. The data were analysed with the objective of performance appraisal of Tharparkar cattle with respect to production traits and to study the effect of genetic factor i.e. sire group and non genetic factors i.e. period and season of calving on production traits.

5p cothumenhmong1 08-12-2019 8 1   Download

HF × Gir cattle, Genetic parameter, First lactation traits The present investigation was carried out with the objective of performance appraisal of HF × Gir cattle with respect to production and reproduction traits. The performance records of 421 HF × Gir half breed cattle sired by 48 bulls were collected for production and reproduction traits spread over a period of 39 years (1977 to 2015) from ResearchCum Development Project on Cattle, Mahatma Phule Krishi Vidyapeeth, Rahuri District Ahmednagar (Maharashtra).

7p chauchaungayxua1 04-12-2019 39 1   Download

Reproductive traits describe the animal’s ability to conceive, calve down and suckle the calf to weaning successfully (Davis 1993). These traits are important since they affect the herd size and off take. Reproductive performance is commonly evaluated by analysing female reproductive traits. The traits regularly considered include age at first calving, calving interval and calving rate. Male fertility traits are rarely included in genetic evaluations despite their influence on the female reproductive performance. These traits include semen quality and quantity traits and scrotal size.

61p conduongdinhmenh 07-05-2013 49 3   Download

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Modeling relationships between calving traits: a comparison between standard and recursive mixed models

9p toshiba18 08-11-2011 56 2   Download