scholarly journals Genetic and non-genetic analysis for milk production and reproductive traits in Holstein cattle in Egypt

2015 ◽  
Vol 20 (1) ◽  
Author(s):  
Eslam Faid Allah
Keyword(s):  
Genetic Analysis ◽  
Milk Production ◽  
Reproductive Traits ◽  
Holstein Cattle

scholarly journals Detection of Quantitative Trait Loci Affecting Milk Production, Health, and Reproductive Traits in Holstein Cattle

2004 ◽  
Vol 87 (2) ◽  
pp. 468-475 ◽  
Author(s):  
M.S. Ashwell ◽  
D.W. Heyen ◽  
T.S. Sonstegard ◽  
C.P. Van Tassell ◽  
Y. Da ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Milk Production ◽  
Quantitative Trait ◽  
Reproductive Traits ◽  
Holstein Cattle ◽  
Trait Loci

scholarly journals A Quantitative Genetic Analysis of Male Sexual Traits Distinguishing the Sibling Species Drosophila simulans and D. sechellia

Genetics ◽  
1999 ◽  
Vol 153 (4) ◽  
pp. 1683-1699 ◽  
Author(s):  
Stuart J Macdonald ◽  
David B Goldstein
Keyword(s):  
Genetic Analysis ◽  
Sibling Species ◽  
Reproductive Traits ◽  
Drosophila Simulans ◽  
Directional Selection ◽  
Posterior Lobe ◽  
Sex Comb ◽  
Tooth Number ◽  
Comb Tooth ◽  
Shape And Size

Abstract A quantitative trait locus (QTL) genetic analysis of morphological and reproductive traits distinguishing the sibling species Drosophila simulans and D. sechellia was carried out in a backcross design, using 38 markers with an average spacing of 8.4 cM. The direction of QTL effects for the size of the posterior lobe was consistent across the identified QTL, indicating directional selection for this trait. Directional selection also appears to have acted on testis length, indicating that sexual selection may have influenced many reproductive traits, although other forms of directional selection cannot be ruled out. Sex comb tooth number exhibited high levels of variation both within and among isofemale lines and showed no evidence for directional selection and, therefore, may not have been involved in the early speciation process. A database search for genes associated with significant QTL revealed a set of candidate loci for posterior lobe shape and size, sex comb tooth number, testis length, tibia length, and hybrid male fertility. In particular, decapentaplegic (dpp), a gene known to influence the genital arch, was found to be associated with the largest LOD peak for posterior lobe shape and size.

scholarly journals GENOME-WIDE ASSOCIATION STUDY FOR MILK PRODUCTION AND REPRODUCTION TRAITS IN RUSSIAN HOLSTEIN CATTLE POPULATION

2016 ◽  
Vol 51 (2) ◽  
pp. 182-193 ◽  
Author(s):  
A.A. Sermyagin A.A. Sermyagin ◽  
◽  
E.A. Gladyr’ E.A. Gladyr’ ◽  
S.N. Kharitonov S.N. Kharitonov ◽  
A.N. Ermilov A.N. Ermilov ◽  
...  
Keyword(s):  
Association Study ◽  
Milk Production ◽  
Genome Wide Association Study ◽  
Genome Wide Association ◽  
Holstein Cattle ◽  
Cattle Population ◽  
Genome Wide ◽  
Reproduction Traits

scholarly journals Changes in production and reproduction traits in population of the Slovak Spotted Cattle

2020 ◽  
Vol 23 (3) ◽  
pp. 161-166
Author(s):  
Jozef Bujko ◽  
Juraj Candrák ◽  
Július Žitný ◽  
Radovan Kasarda
Keyword(s):  
Dairy Cows ◽  
Population Size ◽  
Milk Production ◽  
Reproductive Traits ◽  
Annual Increase ◽  
Stable Level ◽  
Average Annual Increase ◽  
Positive Growth ◽  
Reproduction Traits

The study aimed to examine the analyses of the trend in the numbers of dairy cows, production and reproductive traits in the population the Slovak Spotted cattle for period 2010 to 2019. The number of Slovak Spotted dairy cows is maintained on a relatively stable level in recent years. There was a decrease in the number of animals (12 428 in 2010), but not as strong as after 1990 (85 518). From 2017 number of animals is rising from 14,062, to 14,150 (2018) and 14,627 (2019), respectively. As compared to 2010 an increase of 13.15% in 2017, 13.86% and 17.68%, in 2018 and 2019 respectively was observed. Population size raised from 113.15% (2017) to 117.68% in 2019 respectively. The average annual increase in milk production between the years 2010 to 2019 was + 157.5 kg of milk (total 1,575 kg of milk), + 5.8 kg of fat (total 58 kg of fat) and + 6.1 kg of protein (total 61 kg of protein). Positive growth of milk production in recent years is slightly comparable with the trend of breeding improvement.

scholarly journals Genomewide Association Analyses of Lactation Persistency and Milk Production Traits in Holstein Cattle Based on Imputed Whole-Genome Sequence Data

Genes ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1830
Author(s):  
Victor B. Pedrosa ◽  
Flavio S. Schenkel ◽  
Shi-Yi Chen ◽  
Hinayah R. Oliveira ◽  
Theresa M. Casey ◽  
...  
Keyword(s):  
Milk Production ◽  
Genome Sequence ◽  
North American ◽  
Milk Fat ◽  
Molecular Mechanisms ◽  
Sequence Data ◽  
Whole Genome Sequence ◽  
Holstein Cattle ◽  
Whole Genome ◽  
Production Traits

Lactation persistency and milk production are among the most economically important traits in the dairy industry. In this study, we explored the association of over 6.1 million imputed whole-genome sequence variants with lactation persistency (LP), milk yield (MILK), fat yield (FAT), fat percentage (FAT%), protein yield (PROT), and protein percentage (PROT%) in North American Holstein cattle. We identified 49, 3991, 2607, 4459, 805, and 5519 SNPs significantly associated with LP, MILK, FAT, FAT%, PROT, and PROT%, respectively. Various known associations were confirmed while several novel candidate genes were also revealed, including ARHGAP35, NPAS1, TMEM160, ZC3H4, SAE1, ZMIZ1, PPIF, LDB2, ABI3, SERPINB6, and SERPINB9 for LP; NIM1K, ZNF131, GABRG1, GABRA2, DCHS1, and SPIDR for MILK; NR6A1, OLFML2A, EXT2, POLD1, GOT1, and ETV6 for FAT; DPP6, LRRC26, and the KCN gene family for FAT%; CDC14A, RTCA, HSTN, and ODAM for PROT; and HERC3, HERC5, LALBA, CCL28, and NEURL1 for PROT%. Most of these genes are involved in relevant gene ontology (GO) terms such as fatty acid homeostasis, transporter regulator activity, response to progesterone and estradiol, response to steroid hormones, and lactation. The significant genomic regions found contribute to a better understanding of the molecular mechanisms related to LP and milk production in North American Holstein cattle.

502 Late-Breaking: Tongue Rolling Behavior in a Large U.S. Dairy Herd

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 177-178
Author(s):  
Jesse Robbins ◽  
Mike Paros ◽  
Kelly McCandless
Keyword(s):  
United States ◽  
Milk Production ◽  
Video Recording ◽  
Dairy Herd ◽  
The United States ◽  
Stereotypic Behavior ◽  
Shared Environment ◽  
Holstein Cattle ◽  
Sampling Strategies ◽  
Pregnancy Status

Abstract Stereotypic behavior is repetitive, invariant behavior with no obvious goal or function and may indicate negative welfare. Non-nutritive oral behaviors are the most common form of stereotypic behavior in captive ungulates and these include tongue rolling where the cow’s tongue is extended, moving inside and outside of the mouth while the cow is not eating. We assessed the prevalence of tongue rolling in a large commercial dairy herd located in the United States by video recording cattle (n = 10,000) during three consecutive milkings on two rotary milking parlors. Associations between tongue rolling behavior, breed, age, days in milk, pregnancy status and milk production were assessed. In total, 29% percent (2,931) of cows were observed tongue rolling on the rotary parlor during at least one milking; 6% (613) were observed tongue rolling during two milkings; and 1.6% (164) were observed tongue rolling during all three sampling periods. Breed was the only variable associated with tongue rolling in the rotary parlor with nearly twice the proportion of Jersey (33%) vs Jersey X Holstein (17%) exhibiting tongue rolling behavior (P < 0.0001). The higher incidence of tongue rolling among Jersey vs Jersey X Holstein cattle within a shared environment suggests a strong genetic component that warrants further investigation. Validated sampling strategies for assessing tongue rolling in dairy cattle are needed.

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