scholarly journals Research Article Genomic association study for age at first calving and calving interval in Romosinuano and Costeño con Cuernos cattle

2019 ◽  
Vol 18 (2) ◽  
Author(s):  
J.C. Fernández ◽  
J.E. Pérez ◽  
N. Herrera ◽  
R. Martínez ◽  
D. Bejarano ◽  
...  
Keyword(s):  
Association Study ◽  
Calving Interval ◽  
Age At First Calving ◽  
Research Article ◽  
Genomic Association

scholarly journals Integrative regression network for genomic association study

2016 ◽  
Vol 9 (S1) ◽  
Author(s):  
Reddy Rani Vangimalla ◽  
Hyun-hwan Jeong ◽  
Kyung-Ah Sohn
Keyword(s):  
Association Study ◽  
Genomic Association

scholarly journals Seasonal Index and Breeding Efficiency of Red Chittagong Cattle in Bangladesh

2013 ◽  
Vol 1 (2) ◽  
pp. 55-61
Author(s):  
M. Ruhul Amin ◽  
Bhuiyan A.K.F.H ◽  
Habib M.A Habib ◽  
Khan M.A.S
Keyword(s):  
Reproductive Behavior ◽  
Reproductive History ◽  
Reproductive Efficiency ◽  
Reproductive Pattern ◽  
Calving Interval ◽  
Age At First Calving ◽  
Breeding Efficiency ◽  
On Farm ◽  
Seasonal Index

The study was aimed to observe reproductive pattern and efficiency of Red Chittagong Cattle (RCC) including reproductive history taken from two different herds; nucleus herd (on-station) and community herd (on-farm) in Mymensingh district of Bangladesh. A total of 184 calving parity records from 66 RCC cows that included 317 estrous, 164 conception and 178 calving history covering a period from 2005 to 2011 were considered for analyses. The highest frequencies of estrous, conception and calving occurred in May (13%, 15% and 14%, respectively), while the lowest in September for estrous (4%) and conception (4%) and April and June for calving (5%). The month of the year had significant (p<0.001 to p<0.05) effect on both estrous and calving but not for conception (p>0.05). There was no significant effect of season with estrous or conception or calving, but numerically highest incidence of estrous and conception in summer (36% and 38%, respectively) and calving in winter (36%) are noted. The seasonal indexes of calving in the on-station and on-farm herds were 0.73 and 0.78 respectively, with an overall mean of 0.68. The breeding or reproductive efficiency of the nucleus herd was estimated based on calving interval and age at first calving along with calving interval and the calculated results were 79 % and 82%, respectively for those two methods of estimation. The result obtained in this study indicates the reproductive behavior of RCC did not differ significantly by season, but varied with month of the year. In addition, reproductive efficiency of RCC in this study was slightly lower than that of expected.

scholarly journals Maternal inheritance on reproductive traits in Brangus-Ibagé cattle

2004 ◽  
Vol 34 (4) ◽  
pp. 1163-1167 ◽  
Author(s):  
Luis Ernani Henkes ◽  
Magda Vieira Benavides ◽  
João Francisco Coelho Oliveira ◽  
José Carlos Ferrugem Moraes ◽  
Tania Azevedo Weimer
Keyword(s):  
Birth Weight ◽  
Heritability Estimate ◽  
Reproductive Traits ◽  
Direct Selection ◽  
Calving Interval ◽  
Age At First Calving ◽  
Linear Effect ◽  
Mtdna Mutations ◽  
D Loop ◽  
Additive Genetic Effects

Cytoplasmic inheritance influence on reproductive traits was investigated in the Brangus-Ibagé cattle (3/8 Nelore x 5/8 Aberdeen Angus). Additive genetic effects were responsible for 12% ± 11% of phenotypic variation observed in first calving interval, but their contribution dropped to zero when all calving intervals (CI) were considered. The heritability estimate for age at first calving (AFC, in days) was 0.19 ± 0.09. Mitochondrial lineage (MIT) had negligible effects on phenotypic variances of calving interval (0.0 ± 0.02), calf birth weight (0.0 ± 0.01), and cow weight at calving (0.0 ± 0.01). However, for the age at first calving, MIT accounted for 0.15 ± 0.07 of total variation. Cow weight at calving had a significant linear effect on CI and AFC. Three D-loop mtDNA mutations significantly affected either calving interval (T®C at sites 16,113 and 16,119) or calf birth weight (T®C at site 16,113). The C variants had decreased CI (29 and 32 days, respectively) and increased calf weight (0.6kg). Although the effects were small, direct selection for these mutation-carrier cows might improve the reproductive and developmental performance in this herd.

scholarly journals Reproductive performance of female swamp buffalo in West Sumatra

2021 ◽  
Vol 748 (1) ◽  
pp. 012025
Author(s):  
R Reswati ◽  
BP Purwanto ◽  
R Priyanto ◽  
W Manalu ◽  
R I Arifiantini
Keyword(s):  
Population Growth ◽  
Reproductive Performance ◽  
Climatic Conditions ◽  
Calving Interval ◽  
Farming Practices ◽  
Age At First Calving ◽  
West Sumatra ◽  
Swamp Buffalo ◽  
Different Altitudes ◽  
Better Than

Abstract The swamp buffalo population in West Sumatra Province decline continuously due to the low female reproductive performance. This research was conducted to identify female buffalo reproductive performance, which could be used as baseline data to enhance its population growth. A survey research method was conducted in two subdistricts, namely Lubuk Basung and Matur, located at different altitudes. Data were collected by interviewing farmers and observing their farms. The parameters observed were age at first mating, age at first calving, calving interval, service per conception, and buffalo farming practices. Significant differences in reproductive performances of female buffalo were observed. Age at first mating 39.04 ± 9.91 and 33.67 ± 5.3 mo., age at first calving 51.61 ± 9.95 and 45.71 ± 5.58 mo., calving interval 27.26 ± 8.84 and 24.17 ± 7.06 mo., and services per conception 1.82 ± 0.82 and 1.55 ± 0.78 were represented buffalo in Lubuk Basung and Matur, respectively. The buffalo reproductive performances in both locations were not optimal; however, Matur’s buffalo reproductive performances were better than those in Lubuk Basung due to its better farming practices and more comfort climatic conditions. Therefore, improving farming practice is essential to enhance buffalo’s reproductive performance and population growth.

Genetic correlations and trends for traits of economic importance in dairy buffalo

2020 ◽  
Vol 60 (4) ◽  
pp. 492 ◽  
Author(s):  
Ranielle Nogueira da Silva Vilela ◽  
Thomaz Marques Sena ◽  
Rusbel Raul Aspilcueta-Borquis ◽  
Leonardo de Oliveira Seno ◽  
Francisco Ribeiro de Araujo Neto ◽  
...  
Keyword(s):  
Milk Fat ◽  
Genetic Correlations ◽  
Reproductive Traits ◽  
Milk Quality ◽  
Calving Interval ◽  
Age At First Calving ◽  
Productive Traits ◽  
Dairy Buffalo ◽  
Genetic Trends ◽  
Low Magnitude

Context The planning and execution of selection programs requires estimates of the genetic correlations between traits. As genetic change is achieved for a given trait, it is important to consider possible genetic changes for other traits. Understanding the magnitude and direction of genetic correlations can assist in selection decisions. Aims The aim of the present study was to estimate the genetic correlations of reproductive traits with productive traits and with percentages of fat and protein in the milk of dairy buffalo. Additionally, genetic trends were estimated for the traits under study over the years. Methods Data from 11530 complete lactations of 3431 female buffalo were used. The following traits were analysed: milk, fat and protein yields; percentages of fat and protein; age at first calving; and calving interval. The (co)variance components were estimated by Bayesian inference in multi-trait analyses, considering a linear animal model. To calculate the genetic trends, the average annual genetic values were regressed on the year of birth. Key results The means of genetic correlations estimated between reproductive (age at first calving and calving interval) and productive (milk, fat and protein yields) traits were positive, but of moderate to low magnitude. The association between the reproductive and milk quality (fat and protein percentages) traits were negative and of low magnitude. Genetic trends for the productive traits were positive (5.25 ± 0.63, 0.15 ± 0.034 and 0.09 ± 0.038 kg/year for milk, fat and protein yields respectively). Genetic trends for the reproductive traits of age at first calving and calving interval increased by 0.47 ± 0.09 and 0.48 ± 0.10 days/year respectively. In terms of milk quality, however, the percentages of fat and protein decreased by 0.016 ± 0.003 and 0.011 ± 0.001%/year respectively. Conclusions Genetic gains in productive traits may elevate the number of days at first calving and extend the calving interval, in addition to leading to the production of milk of lower quality. Implications The use of a multi-trait selection index is an alternative, as it combines information from different sources, such that an optimal selection criterion can be achieved over time by virtue of its emphasis on appropriate weighting for all traits.

Key indicators and decision-making trees to analyse reproduction problems linked to environmental factors: data from a commercial dairy unit

2009 ◽  
Vol 2009 ◽  
pp. 14-14
Author(s):  
E Knapp ◽  
P Chapaux ◽  
L Istasse ◽  
K Touati
Keyword(s):  
Decision Making ◽  
Environmental Factors ◽  
Dairy Herds ◽  
Calving Interval ◽  
Gross Margin ◽  
Age At First Calving ◽  
Key Indicators

Reproduction performances in cattle regularly decreased with time. For example, the number of inseminations per pregnancy increased in dairy herds from 1.43 to 1.75 and the calving interval (CI) from 385 to 412 days in 10 years (Leroy et al., 2006). Such a reduction is responsible for rising income losses for breeders. In Belgium, an increase of the age at first calving (AFC) by 3 months and of the CI by 20 days induced a gross margin reduction of about 500 € /cow/year.

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