Genetic response for milk production traits, somatic cell score, acidity and coagulation properties in Italian Holstein–Friesian population under current and alternative selection indices and breeding objectives

Pretto, Denis; López‐Villalobos, N.; Penasa, M.; Cassandro, Martino

doi:10.1016/j.livsci.2012.08.001

Cited by 15 publications

(21 citation statements)

References 29 publications

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“…The coefficients obtained here are not optimal, but the lack in prediction is compensated by the higher number of records obtained per cow when MIRS is routinely implemented. Pretto et al (2012) provided an accurate estimation of the genetic progress achievable under different breeding scenarios.…”

Section: Discussionmentioning

confidence: 99%

“…In a recent study, Pretto et al (2012) reported that current selection index for Italian-Holstein breed leads to a small genetic improvement of MCP, and thus the direct inclusion of RCT and a 30 is necessary to genetically enhance coagulation traits. This is the consequence of the rather low genetic correlations between MCP and most production and quality traits (except for a 30 with PP and CP), as confirmed in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…Genetic correlations among MCP, yield and composition traits revealed that technological properties of milk can be improved without hampering selection for production and quality traits (Pretto et al, 2012). However, direct phenotyping for renneting ability would result in higher genetic gain because both related traits (Pretto et al, 2012) and protein genotypes Penasa et al, 2010;Vallas et al, 2012) are not able to give the same genetic change.…”

Section: Introductionmentioning

confidence: 99%

“…However, direct phenotyping for renneting ability would result in higher genetic gain because both related traits (Pretto et al, 2012) and protein genotypes Penasa et al, 2010;Vallas et al, 2012) are not able to give the same genetic change. For instance, genetic correlations of MCP were found negligible with milk yield but moderate to strong with protein and casein percentages and SCC, generally moderate with fat percentage, and strong with milk pH.…”

Section: Introductionmentioning

confidence: 99%

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Heritability and repeatability of milk coagulation properties predicted by mid-infrared spectroscopy during routine data recording, and their relationships with milk yield and quality traits

Tiezzi

Pretto

Marchi

et al. 2013

Animal

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The aim of this study was to estimate (co)variance components for milk coagulation properties (MCP) predicted by mid-infrared spectroscopy (MIRS) during routine milk recording, and to assess their relationships with yield and quality traits. A total of 63 470 milk samples from Holstein-Friesian cows were analyzed for MCP, pH and quality characteristics using MIRS. Casein to protein and protein to fat ratios were calculated from information obtained by MIRS. Records were collected across 1 year on 16 089 cows in 345 herds. The model used for genetic analysis included fixed effects of parity and stage of lactation, and random effects of herd-test-day, cow permanent environmental, animal additive genetic and residual. (Co)variance components were assessed in a Bayesian framework using the Gibbs Sampler. Estimates of heritabilities were consistent with those reported in the literature, being moderate for MCP (0.210 and 0.238 for rennet coagulation time (RCT) and curd firmness (a 30 ), respectively), milk contents (0.213 to 0.333) and pH (0.262), and low for somatic cell score (0.093) and yield traits (0.098 to 0.130). Repeatabilities were 0.391 and 0.434 for RCT and a 30 , respectively, and genetic correlations were generally low, with estimates greater than 0.30 (in absolute value) only for a 30 with fat, protein and casein contents. Overall, results suggest that genetic evaluation for MCP predicted by MIRS is feasible at population level, and several repeated measures per cow during a lactation are required to estimate reliable breeding values for coagulation traits.Keywords: heritability, genetic correlation, mid-infrared spectroscopy, milk coagulation property, Holstein-Friesian dairy cow ImplicationsThis paper aimed at assessing parameters which will be useful to estimate the genetic merit of dairy cattle for milk coagulation properties (MCP) predicted by mid-infrared spectroscopy (MIRS) during routine data recording. Estimates of heritability and genetic correlation indicate that selection for coagulation ability is feasible without altering results for milk quality traits. Selection for MCP can be helped, but not substituted, by selection for fat, protein and casein percentages. Repeated measures per cow are needed but MIRS seems to be suitable for genetic purposes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heritability and repeatability of milk coagulation properties predicted by mid-infrared spectroscopy during routine data recording, and their relationships with milk yield and quality traits

Tiezzi

Pretto

Marchi

et al. 2013

Animal

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“…Therefore, the quality of milk used for cheese production is very important in Italy and milk coagulation properties (MCP) are of particular interest . The MCP have been widely studied in recent years and have been proposed as technological traits to increase the efficiency of the dairy industry Pretto et al, 2012. Also, MCP can be rapidly and cheaply predicted using mid-infrared spectroscopy, which allows the collection of phenotypes at the population level (De Marchi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimation of economic values for milk coagulation properties in Italian Holstein-Friesian cattle

Cassandro

Pretto

López‐Villalobos

et al. 2016

Journal of Dairy Science

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The economic values (EV) of production traits, rennet coagulation time (RCT, min), and curd firmness (a30, mm) were derived for Italian Holstein-Friesian dairy cattle, based on the Grana Padano cheese industry. Three different sets of EV for RCT and a30 were estimated, assuming +2.5% (scenario 1), +5% (scenario 2), and +10% (scenario 3) increment in cheese yield due to the effect of milk coagulation properties (MCP). A model was developed to simulate the transformation of milk into Grana Padano cheese. The EV of RCT and a30 were -€2.213, -€4.426, and -€8.852/min, and €0.877, €1.755, and €3.509/mm for scenarios 1, 2, and 3, respectively. Relative emphasis of traits in the breeding objectives of the Italian Holstein-Friesian dairy cattle population should account for the effect of MCP on cheese yield. Economic values for milk components and MCP were affected by changes of dairy products, whereas variations of feed prices did not influence EV of RCT and a30.

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Responses in lactose yield, lactose percentage and protein-to-protein-plus-lactose ratio from index selection in New Zealand dairy cattle

Sneddon

López‐Villalobos

Davis

et al. 2016

New Zealand Journal of Agricultural Research

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The breeding goal of the New Zealand dairy industry is to improve the genetic capability of cows to convert pasture-based feed into farmer profit. The New Zealand dairy industry exports over 95% of milk produced and the most significant product by export volume is whole milk powder (WMP). The current selection objective, breeding worth (BW), will increase yields of protein and fat, potentially shifting milk composition further from the ideal composition for making WMP. This study aimed to investigate the correlated responses in lactose yield (LY), lactose percentage (LP) and protein-to-protein-plus-lactose ratio (P:P + L) from selection for BW, BW plus LY, BW plus LP and BW plus P:P + L. Selection for BW is predicted to have per-cow responses of 54.92 kg milk/year, 2.22 kg fat/year, 1.78 kg protein/year and 2.84 kg lactose/year. When lactose was included in the selection objective in the form of LY, LP or P:P + L, genetic responses ranged from −59.98 kg to 61.08 kg milk/year and from −2.67 kg to 3.70 kg lactose/year. The industry could reduce imported lactose requirements per tonne of WMP by 6%-11% by including lactose into the selection objective, compared with selection on BW alone.

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Genetic response for milk production traits, somatic cell score, acidity and coagulation properties in Italian Holstein–Friesian population under current and alternative selection indices and breeding objectives

Cited by 15 publications

References 29 publications

Heritability and repeatability of milk coagulation properties predicted by mid-infrared spectroscopy during routine data recording, and their relationships with milk yield and quality traits

Heritability and repeatability of milk coagulation properties predicted by mid-infrared spectroscopy during routine data recording, and their relationships with milk yield and quality traits

Estimation of economic values for milk coagulation properties in Italian Holstein-Friesian cattle

Responses in lactose yield, lactose percentage and protein-to-protein-plus-lactose ratio from index selection in New Zealand dairy cattle

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