Genetic and Environmental Influences on Milk and Milk Component Production

Hargrove, G.L.; Mbah, D.A.; Rosenberger, James L.

doi:10.3168/jds.s0022-0302(81)82730-0

Cited by 18 publications

(19 citation statements)

References 15 publications

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“…The two data sets gave such similar results that later individual herds, groups of three, groups of six, and the complete set (herds 1 to 24) were analyzed separately relations between milk and protein are more similar from study to study than correlations between milk and fat (4,11,15,16,27). The greater heritabilities in this study may be due to the tendency shown in many studies [e.g., (7)] for heritability to increase with herd production, which is much greater in these data than in data used in earlier studies.…”

Section: Resultssupporting

confidence: 52%

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Genetic (Co)Variances for Milk, Fat, and Protein Yield in Holsteins Using an Animal Model

Vleck¹,

Dong²

1988

Journal of Dairy Science

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First lactation milk, fat, and protein yields for first lactations of 8044 Holstein cows in New York from 24 herds were used to estimate genetic and phenotypic covariances with an animal model by restricted maximum likelihood. Numerator relationships within herd, including those from sires, were utilized, although relationships across herds were ignored. Each analysis was terminated after 300 rounds of iteration. Average milk production (twice daily milking, 305-d lactation, mature equivalent) was 8630 kg. Estimates were obtained for each individual herd and groups of 3, 6, and 12 herds. Average estimates from separate analyses of the 24 herds were nearly identical to those from combined analysis. Heritability estimates from combined analysis were .36, .35, and .33 for milk, fat, and protein yield with standard errors of approximately .03. Genetic correlations were .72 for milk and fat, .88 for milk and protein, and .77 for fat and protein. Phenotypic correlations were .81, .91, and .82. Heritability estimates for individual herds were quite variable with standard errors of about .15. The largest environmental standard deviation for a herd was about twice the smallest. Estimates from only one analysis failed to converge-a group of three herds. All single herd analyses reached convergence as did the other 7 trios of herds and all sets of 6 and 12 herds.

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Section: Resultssupporting

confidence: 52%

“…Because the data resulted mostly from daughters of proved bulls, heritability estimates might have been reduced because of selection. Hargrove et al (11). using differences from modified contemporary averages and method 1 of Henderson (12), reported estimates similar to those of Lawlor (15).…”

Section: Introductionsupporting

confidence: 69%

Genetic (Co)Variances for Milk, Fat, and Protein Yield in Holsteins Using an Animal Model

Vleck¹,

Dong²

1988

Journal of Dairy Science

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“…Also they found that some ofthe relationships were nearer to zero for the 3 r and later parities, perhaps because of selection bias. Results of the present .study were generally consistent with previous reports (DE JAGER and KENNEDY, 1987;HARGROVE et al, 1981;MAIJALA and HANNA, 1974). WELPER and FREEMAN (1992) found that genetic correlations for the l st lactation of Lc% was -0.30 with MY but the corresponding estimates between MY with F% and P% were also negative but were larger than that found between MY and Lc%.…”

Section: Y=xb+xu+esupporting

confidence: 83%

“…data sets are presented in Table 6. All estimates are moderate and positive values that genetically ranged from .01 to .22 while phenotypically ranged from .04 to .22 and more nearly in agreement with previous works (DE JAGER and KENNEDY, 1987;HARGROVE et al, 1981;MAIJALA and HANNA, 1974). Estimates of L R s that were >0 15 was obtained only for high HF% genes and HF.…”

Section: Correlations Of Scs With Milk Production Within Paritysupporting

confidence: 77%

Lactation and Sample Test-Day Multi-trait animal model for genetic evaluation of somatic cell scores in Hungarian Holstein-Friesian crossbreeds

Amin

2001

Arch. Anim. Breed.

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Friesian (HF), Hungarian Native Breed (NHB) and four of their crossbreeds were used. Multi trait animal model was used for the estimation of all genetic and phenotypic (co)-variances All estimates of correlations either genetic (R g ) or phenotypic (R p ) beUveen SCS and milk production traits were mostly negative except with protein percentage. Lactation (L) estimates of R i between SCS L and total milk yield (MY), fat (F L ), protein (P L ) and lactose (Lc L ) percentages were -.11+.10, -.12+.Ü4, .09+.03, and -.18+.09, respectively and the corresponding sample test-day estimates (STD) were -. 13+.07, -. 13+.08 11+ 04 -11+08 respectively. L and STD R p estimates of SCS with MY and protein were higher than the corresponding R.' LRg of SCS with MY and protein and L-R p with fat and lactose were increased with parity. R g either L or STD with fat decreased with the parity. The highest estimates of L-Ä g of SCS with MY were negative for HF in the 2 and the 3 parity and were ranged from -0.13 to -0.17. R g of SCS STD with daily milk yield (DY) across parity in different genetic groups were higher than the corresponding with MY. All correlations of SCS with protein were positive. L-R g ranged from .17 to .22 for HF vs. .01 to .04 for NHB. While L-R. ranged from 06 to 15 for HF vs. .04 to .11 for NHB. It could be concluded that, trend ofthe relationship for SCS with milk production may had some change in crossbred than purebred aecording to percentage of crossing.

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“…For fat yield and protein yield the heritability estimates are in the range 0.20 to 0.40 [9][10][11][12] . Repeatability estimates of yield traits are high and range from 0.50 to 0.55 6,12 .…”

Section: Introductionmentioning

confidence: 99%

Holştayn Frizyan ve İngiliz Holştayn Sütçü Sığırlarında Süt Özelliklerinin Varyans Unsurları ve Genetik Parametrelerinin Tahmini

Pirzada¹

2009

Kafkas Univ Vet Fak Derg

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SummaryThe objectives of this study were to estimate the genetic parameters of milk traits of dairy cows and to examine the associations among these traits in both Holstein-Friesian and British-Holstein. The data used in this study was obtained from (LSUK), an organisation for the recording of milk, health and service parameters of dairy cows in Scotland. The data consisted of information on total lactation milk, fat and protein yield. The final number of production records retained in the production database after all edits was 70931. Variance components and genetic parameters for milk, fat and protein yield were estimated using the ASREML program. Analysis for milk, fat and protein yield was conducted for each of the prepared data sets using a univariate animal model. Mean calving age ranged from 29-65 months. The mean lactation length ranged from 300-320 days. The heritabilities of these traits were ranging from 0.22 to 0.52. The heritabilities of milk, fat and protein yield were higher in Holstein-Friesian than British-Holstein. For most of the traits, phenotypic correlations were larger than the genetic correlations. The results showed that there were moderate-strong positive genetic and phenotypic correlations among the production traits. The genetic correlations ranged from 0.38 between milk and fat yield to 0.92 between milk and protein yield. Keywords: Genetic parameters, Milk traits, Variance components, Holstein Holştayn Frizyan ve İngiliz Holştayn Sütçü Sığırlarında Süt Özelliklerinin Varyans Unsurları ve Genetik Parametrelerinin Tahmini ÖzetÇalışmanın amacı Holştayn ve İngiliz Holştayn ineklerinin süt verim özelliklerinin genetik parametrelerini tahmin etmektir. Çalışmada kullanılan veriler İskoçya da süt ineklerinin süt, sağlık ve dölverimi kayıtlarını tutan bir şirketten (LSUK) temin edilmiştir. Bütün düzeltmelerden sonra laktasyon süt verimi, yağ ve proteinin bulunduğu 70931 adet veri kullanılmıştır. Süt, yağ ve proteinin varyans unsurlarının tahmininde ASREML programı kullanılmıştır. Bahsedilen özelliklerin tahmininde tek özellikli bireysel hayvan modeli kullanılmıştır. Ortalama buzağılama yaşı 26-65 ay, ortalama laktasyon uzunluğu da 300-320 gün olarak belirlenmiştir. Bahsedilen özelliklerin kalıtım dereceleri de 0.22 ile 0.52 arasındadır ve Holştaynların bu değerleri İngiliz Holştaynlarından büyüktür. Bir çok özellik için fenotipik korelasyonlar genetik korelasyonlardan daha kuvvetli bulunmuştur. Süt ve yağ arasındaki genetik korelasyon katsayısı 0.38 bulunurken, süt ve protein arasındaki 0.92 olarak belirlenmiştir.

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Genetic and Environmental Influences on Milk and Milk Component Production

Cited by 18 publications

References 15 publications

Genetic (Co)Variances for Milk, Fat, and Protein Yield in Holsteins Using an Animal Model

Genetic (Co)Variances for Milk, Fat, and Protein Yield in Holsteins Using an Animal Model

Lactation and Sample Test-Day Multi-trait animal model for genetic evaluation of somatic cell scores in Hungarian Holstein-Friesian crossbreeds

Holştayn Frizyan ve İngiliz Holştayn Sütçü Sığırlarında Süt Özelliklerinin Varyans Unsurları ve Genetik Parametrelerinin Tahmini

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