scholarly journals Holstein İneklerde GH/AluI Polimorfizmi ile Bazı Süt Verim Özellikleri Arasındaki İlişkiler

2018 ◽  
Vol 6 (5) ◽  
pp. 602
Author(s):  
Zeynep Sönmez ◽  
Memiş Özdemir ◽  
Bahri Bayram ◽  
Vecihi Aksakal
Keyword(s):  
Milk Yield ◽  
Yield Traits ◽  
Production Traits ◽  
Milk Production Traits ◽  
Balance Test ◽  
Lactation Length ◽  
Genotype Frequencies ◽  
Gh Gene ◽  
Hardy Weinberg Equilibrium ◽  
Organically Grown

The aim of this study is to determine the genotype and allelic frequencies of Growth Hormone (GH) gene, to present the genetic variation, and to research the relationships between the GH genotypes and some milk production traits of 115 organically grown Holstein cows. It was seen that GH gene LL, LV ve VV genotype frequencies is 0.41, 0.49, ve 0.10 respectively, and is stable according to Hardy-Weinberg equilibrium genetic balance test in the cattle population. Moreover, Lactation milk yield averages were found to be 7136 kg, 7470 kg and 8017 kg for the LL, LV and VV genotypes, respectively. There was no statistically significant relationship between the actual lactation milk yield, 305d milk yield, peak daily yield, lactation length averages of different genotypes. In the study, GH/AluI polymorphism was found to be insufficient for improvement of the milk yield traits alone.

Genetic and environmental causes of variation in milk production traits of Sahiwal cattle in Pakistan

1998 ◽  
Vol 66 (2) ◽  
pp. 307-318 ◽  
Author(s):  
A. Dahlin ◽  
U. N. Khan ◽  
A. H. Zafar ◽  
M. Saleem ◽  
M. A. Chaudhry ◽  
...  
Keyword(s):  
Animal Model ◽  
Environmental Factors ◽  
Milk Production ◽  
Milk Yield ◽  
Expectation Maximization Algorithm ◽  
Production Traits ◽  
Milk Production Traits ◽  
Mean Values ◽  
Lactation Length ◽  
Environmental Causes

AbstractData from about 4000 Sahiwal cows from eight large herds in Pakistan were used to study the influence of genetic and environmental factors on some milk production traits. First-lactation mean values were 1363 kg, 1395 kg and 252 days for milk yield up to 305 days after calving, total lactation yield and lactation length, respectively. Second and third lactation yields were proportionately 0·12 and 0·18 higher, respectively, at 305 days. The effect of herd-year at calving was by far the most important source of variation for all traits. Heritabilities estimated in uni- and trivariate analyses, using restricted maximum likelihood (REML) with an expectation maximization algorithm for an animal model, ranged from 0·14 to 0·17 for first-lactation traits. The estimates were generally lower for second lactation and higher for third lactation traits. Genetic correlation between lactations for the same trait were close to unity, whilst the phenotypic were considerably lower. Repeatabilities for milk yield traits were 0·42 and for lactation length 0·31. Genetic and phenotypic correlations between first-lactation 305-day milk yield and lactation length were 0·83 and 0·71, respectively. Genetic trends for all traits were close to zero but a substantial deterioration in performance, caused by negative environmental factors, was observed. Although the heritabilities were low, the prospects for genetic improvement are good, as indicated by a rather large additive genetic variation. A multivariate animal model, including the first three lactations of 305-day milk yield, was recommended for the most accurate prediction of breeding values for milk production.

Environmental and genetic causes of variation in production traits of Damascus goats. 2. Goat productivity

1984 ◽  
Vol 38 (1) ◽  
pp. 99-104 ◽  
Author(s):  
A. P. Mavrogenis ◽  
A. Constantinou ◽  
A. Louca
Keyword(s):  
Genetic Correlation ◽  
Milk Production ◽  
Milk Yield ◽  
Genetic Influences ◽  
Yield Traits ◽  
Production Traits ◽  
Quadratic Effect ◽  
Litter Weight ◽  
Lactation Length ◽  
Weaning Age

ABSTRACTData on 1474 lactation records obtained from 1972 to 1978 were used to study environmental and genetic influences on production characters in the Damascus goat. Year and month of kidding had a significant effect on 90- and 150-day milk production after weaning, lactation length and litter weight at weaning (P < 0·01), but no influence on litter weight at birth. Milk production after weaning was not related to litter weight at birth or at weaning. Age of goat at kidding had a significant quadratic effect on milk production, and litter weight at birth and at weaning. No such effects were found for lactation length.Estimates of heritability, from paternal half-sib correlations, for 90- and 150-day milk production were similar (0·29 (s.e. 0·14)). The genetic correlation between 90- and 150-day milk yield (0·92 (s.e. 0·03)) was high, indicating that part and whole lactation yields are influenced by the same genes. The phenotypic correlations among milk yield traits and lactation length were also high and positive.

scholarly journals Genetic Evaluation Of Red Chittagong Cattle In Bangladesh

2020 ◽  
Vol 17 (2) ◽  
pp. 141-154 ◽  
Author(s):  
F Ferdous ◽  
MP Choudhury ◽  
MO Faruque ◽  
MM Hossain ◽  
AKFH Bhuiyan
Keyword(s):  
Birth Weight ◽  
Milk Production ◽  
Milk Yield ◽  
Growth Traits ◽  
Production Traits ◽  
Milk Production Traits ◽  
Lactation Length ◽  
Daily Milk Yield ◽  
Daily Gain ◽  
Daily Milk

The current study was carried out using data of the Nucleus Herd and Community Herd of Red Chittagong Cattle (RCC) established through USDA funded Red Chittagong Cattle project under the Department of Animal Breeding and Genetics, BAU, Mymensingh. Data on 151 calves and 75 lactating cows were analyzed. The estimated heritability values were 0.45 ± 0.05 for birth weight, 0.48 ± 0.05 for weaning weight, 0.41 ± 0.08 for pre-weaning daily gain, 0.47 ± 0.06 for lactation length, 0.43 ± 0.07 for lactation milk yield and 0.35 ± 0.09 for average daily milk yield. The highest Breeding Value (BV) were for birth weight (3.2 kg), weaning weight (24.46 kg), pre-weaning daily gain (82.39g), lactation length (52.25 days), lactation milk yield (186.04 kg) and average daily milk yield (0.66 kg). The minimum and maximum phenotypic index values by using phenotypic parameters were for growth traits (1196.24 and 4713.24) and milk production traits (8573.93 and 40670.81). The minimum and maximum genetic index values by using breeding values were for growth traits (1812.49 and 2870.21) and milk production traits (-1812.49 and 2870.21). All the estimated index values can be used in animal selection and breeding programs for RCC improvement and similar index selection can be applied for other indigenous cattle development programs in Bangladesh or elsewhere. SAARC J. Agri., 17(2): 141-154(2019)

Effect of Service Period, Gestation Period and Dry Period on Milk Production Traits in Kankrej Cattle

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
Nawal Kishor Pareek ◽  
K. J. Ankuya ◽  
M. P. Patel ◽  
B. S. Rathod ◽  
K. B. Prajapati
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Genetic Factors ◽  
Gestation Period ◽  
Research Station ◽  
Production Traits ◽  
Milk Production Traits ◽  
Dry Period ◽  
Lactation Length ◽  
Service Period

The present investigation was undertaken to study the effect of non-genetic factors, viz., service period (SP), dry period (DP) and gestation period (GP) on various milk production traits in Kankrej cattle. 1235 lactation records (2nd-7th) of 475 Kankrej cows, progeny of 75 bulls that were maintained at University Livestock Research Station, Sardarkrushinagar (Gujarat), calved during 1980-2014, were studied. The effects of service period (111.64 ± 52.55 days) and dry period (143.17±28.78 days) on total lactation milk yield (2089.45±582.38 kg),305 days milk yield (2045.66±531.92 kg) and lactation length (282.90±49.46 days) were highly significant (pis less than 0.01), while the effect of gestation period (288.86±7.14 days) was non-significant on all these production traits. Cows which took more time to conceive after parturition produced more milk with longer lactation length

scholarly journals Exploring the relationship between polymorphisms of leptin and IGF-1 genes with milk yield in indicine and taurine crossbred cows

2019 ◽  
Author(s):  
Mohammad Rayees Dar ◽  
Mahendra Singh ◽  
Sunita Thakur ◽  
Archana Verma
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Production Performance ◽  
Yield Traits ◽  
The Novel ◽  
Production Traits ◽  
Milk Production Traits ◽  
The Relationship ◽  
Karan Fries ◽  
Apparently Healthy

ABSTRACTLeptin and IGF-1 plays a significant role in milk production and lactation in bovines. The present investigation was carried out to identify the novel polymorphisms in exon 3 region of leptin gene and exon 3 + partial intron 3 of IGF-1 gene and to analyze their association with the milk production performance in indicine and taurine crossbred (Karan Fries) cows. Blood samples were collected from 160 apparently healthy Karan Fries cows. Four SNPs at positions rs29004508 (C>T), rs29004509 (C>T), rs29004510 (T>C), rs29004511 (T>C) in Leptin gene and two SNPs at positions rs133251968 (C>A), rs137289661(C>T) in IGF-1 gene were found in Karan Fries cows, however rs29004509 (C>T) had positive correlation (p<0.05) with milk yield. The genetic variants observed in exon 3 region of leptin gene and their association with milk yield traits revealed the importance of CT genotype, which had been useful for genetic improvement of Karan Fries cow for milk production traits and can also be utilized as a potential genetic marker to select appropriate animals.

scholarly journals Genetic Association of PPARGC1A Gene Single Nucleotide Polymorphism with Milk Production Traits in Italian Mediterranean Buffalo

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Seyed Mahdi Hosseini ◽  
Ye Tingzhu ◽  
Majid Pasandideh ◽  
Aixin Liang ◽  
Guohua Hua ◽  
...  
Keyword(s):  
Candidate Gene ◽  
Milk Production ◽  
Milk Yield ◽  
Hormone Receptors ◽  
Fiber Type ◽  
Sequencing Analysis ◽  
Production Traits ◽  
Milk Production Traits ◽  
Milk Traits ◽  
Lactation Length

PPARGC1A gene plays an important role in the activation of various important hormone receptors and transcriptional factors involved in the regulation of adaptive thermogenesis, gluconeogenesis, fiber-type switching in skeletal muscle, mitochondrial biogenesis, and adipogenesis, regulating the reproduction and proposed as a candidate gene for milk-related traits in cattle. This study identified polymorphisms in the PPARGC1A gene in Italian Mediterranean buffaloes and their associations to milk production and quality traits (lactation length, peak milk yield, fat and protein yield, and percentage). As a result, a total of seven SNPs (g.-78A>G, g.224651G>C, g.286986G>A, g.304050G>A, g.325647G>A, g.325817T>C, and g.325997G>A) were identified by DNA pooled sequencing. Analysis of productivity traits within the genotyped animals revealed that the g.286986G>A located at intron 4 was associated with milk production traits, but the g.325817T>C had no association with milk production. Polymorphisms in g.-78A>G was associated with peak milk yield and milk yield, while g.304050G>A and g.325997 G>A were associated with both milk yield and protein percentage. Our findings suggest that polymorphisms in the buffalo PPARGC1A gene are associated with milk production traits and can be used as a candidate gene for milk traits and marker-assisted selection in the buffalo breeding program.

scholarly journals Some production traits of indigenous Hair goats bred under extensive conditions in Turkey. 1st communication: reproduction, milk yield and hair production traits of does

2008 ◽  
Vol 51 (5) ◽  
pp. 498-506 ◽  
Author(s):  
H. Deger Oral Toplu ◽  
A. Altinel
Keyword(s):  
Milk Production ◽  
Litter Size ◽  
Milk Yield ◽  
Birth Rate ◽  
Live Weight ◽  
Lactation Period ◽  
Production Traits ◽  
Milk Production Traits ◽  
Lactation Length ◽  
Staple Length

Abstract. This study was conducted to investigate the reproductive performance, milk yield, hair production, fleece characteristics and body weight after shearing of Hair goats (Anatolian Black Goats), bred under extensive conditions in Turkey. The material of the study was formed a total data of 456 Hair goats, which were between 2 and 7 years of age bred in the period of two years. Conception rate, infertility rate, abortion rate, kidding rate, single birth rate, twin birth rate, the percentage of kids born according to mated does and litter size were 97.81 %, 2.19 %, 3.59 %, 94.30 %, 97.91 %, 2.09 %, 96.27 % and 1.02, respectively. Lactation length, milk yield in lactation period, milking period and milk yield in milking period of goats were determined as 232.29 days, 100.92 kg, 132.09 days and 43.14 kg, respectively. Hair production, fibre diameter and staple length of Hair goats in the study were determined as 381.00 g, 76.70 micrones and 13.63 cm, respectively. It was found that the effects of production year and farm on the reproductive traits given by percentage weren’t statistically significant, whereas the difference among production years for litter size was significant. It was found that the effect of production year on milk production traits except for lactation length and on the hair production; the effect of farm factor on the hair production, staple length and live weigth after shearing; the effect of age on the milk production traits, hair production traits and live weight after shearing; the effect of live weight on the hair production were statistically significant (p<0.05).

A comparison of milk production traits in Friesian × White Fulani crossbred cattle

1981 ◽  
Vol 32 (2) ◽  
pp. 165-170 ◽  
Author(s):  
V. Buvanendran ◽  
M. B. Olayiwole ◽  
K. I. Piotrowska ◽  
B. A. Oyejola
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Production Traits ◽  
Genetic Contribution ◽  
Crossbred Cattle ◽  
Milk Production Traits ◽  
Lactation Length ◽  
Calf Mortality ◽  
White Fulani ◽  
Calving Intervals

ABSTRACTA study was made of the performance of different grades of Friesian × White Fulani crosses using 12 years' records from 1967 to 1978. Milk yield increased progressively with increases in the proportion of Friesian genes. Lactation length also showed a similar trend, with a difference between 1/2 and 7/8 grades of 41 days. Calving intervals averaged approximately 390 days and did not differ among grades. Calf mortality was high, varying from 16 to 29%. The optimal genetic contribution from the Friesian for this environment is considered to be higher than 75 %

An association analysis between PRL genotype and milk production traits in Italian Mediterranean river buffalo

2017 ◽  
Vol 84 (4) ◽  
pp. 430-433 ◽  
Author(s):  
Jun Li ◽  
Aixin Liang ◽  
Zipeng Li ◽  
Chao Du ◽  
Guohua Hua ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Fat Content ◽  
Phenotypic Variance ◽  
River Buffalo ◽  
Production Traits ◽  
Milk Production Traits ◽  
Exon 2 ◽  
Mediterranean River

This Research Communication describes the association between genetic variation within the prolactin (PRL) gene and the milk production traits of Italian Mediterranean river buffalo (Bufala mediterranea Italiana). High resolution melting (HRM) techniques were developed for genotyping 465 buffaloes. The association of genetic polymorphism with milk production traits was performed and subsequently the effects of parity and calving season were evaluated. Single nucleotide polymorphisms (SNPs) were identified at exons 2 and 5 and at introns 1 and 2. All the SNPs were in Hardy–Weinberg equilibrium, and statistical analysis showed that the polymorphism of intron1 was significantly (P < 0·05) associated with milk yield, milk protein content and peak milk yield. The average contribution of the intron1 genotype (r2intron1) to total phenotypic variance in milk production traits was 0·09, and the TT genotype showed lower values than CC and CT genotypes. A nonsynonymous SNP was identified in exon 2, which resulted in an amino acid change from arginine to cysteine. Moreover, the polymorphism of exon 2 was associated significantly with milk fat content (P < 0·05), and the buffaloes with TT genotype showed higher total fat content than the buffaloes with CT genotype. These findings provide evidence that polymorphisms of the buffalo PRL gene are associated with milk production traits and PRL can be used as a candidate gene for marker-assisted selection in Italian Mediterranean river buffalo breeding.

scholarly journals Sequence Variations in the Bovine Growth Hormone Gene Characterized by Single-Strand Conformation Polymorphism (SSCP) Analysis and Their Association with Milk Production Traits in Holsteins

Genetics ◽  
1996 ◽  
Vol 144 (4) ◽  
pp. 1809-1816 ◽  
Author(s):  
Jianbo Yao ◽  
Samuel E Aggrey ◽  
David Zadworny ◽  
J Flan Hayes ◽  
Urs Kühnlein
Keyword(s):  
Growth Hormone ◽  
Milk Production ◽  
Milk Yield ◽  
Single Strand Conformation Polymorphism ◽  
Sscp Analysis ◽  
Bovine Growth Hormone ◽  
Production Traits ◽  
Milk Production Traits ◽  
Sequence Variations ◽  
Conformation Polymorphism

Sequence variations in the bovine growth hormone (GH) gene were investigated by single strand conformation polymorphism (SSCP) analysis of seven amplified fragments covering almost the entire gene (2.7 kb). SSCPs were detected in four of these fragments and a total of six polymorphisms were found in a sample of 128 Holstein bulls. Two polymorphisms, a T→C transition in the third intron (designated GH4.1) and an A→C transversion in the fifth exon (designated GH6.2), were shown to be associated with milk production traits. GH4.1c/GH4.1c bulls had higher milk yield than GH4.1c/GH4.1t (P ≤ 0.005) and GH4.1t/GH4.1t (P ≤ 0.0022) bulls. GH4.1c/GH4.1c bulls had higher kg fat (P ≤ 0.0076) and protein (P ≤ 0.0018) than GH4.1c/GH4.1t bulls. Similar effects on milk production traits with the GH6.2 polymorphism were observed with the GH6.2a allele being the favorable allele. The average effects of the gene substitution for GH4.1 and GH6.2 are similar, with ±300 kg for milk yield, ±8 kg for fat content and ±7 kg for protein content per lactation. The positive association of GH4.1c and GH6.2a with milk production traits may be useful for improving milk performance in dairy cattle.

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