Genetic parameters for milk yield in imported Jersey and Jersey-Friesian cows using daily milk records in Sri Lanka

Samaraweera, Amali Malshani; Boerner, Vinzent; Cyril, H. W.; Werf, J. H. J. van der; Hermesch, Susanne

doi:10.5713/ajas.19.0798

Cited by 4 publications

(8 citation statements)

References 35 publications

(46 reference statements)

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“…In support, Sarkar et al [ 2 ] demonstrated that cows fed TMR briquettes produced more milk than cows fed fresh forages supplemented with concentrates. The average milk production of our cows falls within the range (6 to 10 kg/d) of Sahiwal × Jersey cows [ 33 ], but is lower than purebred Jersey cows in Sri Lanka [ 34 ]. Milk protein yield tended to increase by 15% ( p = 0.091) for TMR briquettes vs. CTL, possibly because of the increased milk yield, as milk protein concentrations were similar among treatments ( p = 0.244).…”

Section: Resultsmentioning

confidence: 99%

Effect of TMR Briquettes on Milk Production, Nutrient Digestibility, and Manure Excretions of Dairy Cows in the Dry Zone of Sri Lanka

Karunanayaka

Nayananjalie

Appuhamy

et al. 2022

Animals

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We showed previously that TMR briquettes made with a variety of forages and industrial by-products had higher crude protein and energy concentrations than the conventional diet including fresh-cut Guinea grass and commercial cattle pellet (CTL). The study objective was to determine to what extent the nutritional advantages of TMR briquettes would be translated into the milk production of dairy cows in the dry zone of Sri Lanka. Nine Jersey × Sahiwal cows were assigned to CTL or two TMR briquettes in a 3 × 3 Latin square design with three periods each including 14 d for production measurement and 7 d for total faeces and urine collection. The TMR briquettes tended to increase milk yield (5.55 to 6.59 kg/d, p = 0.092), milk protein yield (0.170 vs. 0.203 kg/d, p = 0.091) and DMI (6.50 to 7.16 kg/d, p = 0.070), and decreased milk urea nitrogen (13.0 to 10.5 mg/dL, p < 0.006). The TMR briquettes had a higher organic matter and neutral detergent fibre digestibility (p < 0.001), and lower urinary N excretions as a % of N intake (p = 0.149). In conclusion, the TMR briquettes can improve forage digestibility, milk production and environmental sustainability of dairy cows in the dry zone of Sri Lanka.

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Section: Resultsmentioning

confidence: 99%

Effect of TMR Briquettes on Milk Production, Nutrient Digestibility, and Manure Excretions of Dairy Cows in the Dry Zone of Sri Lanka

Karunanayaka

Nayananjalie

Appuhamy

et al. 2022

Animals

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“…The values for lactation curve parameters were derived from the curve parameters of 305‐day milk yield described in the study by Samaraweera et al. (2020). For a given calving interval (CI, days), a lactation length (LL, days) of

CI ‐ 60

was assumed, with 60 days being the dry period.…”

Section: Methodsmentioning

confidence: 99%

“…where values for initial milk yield (a), increasing slope (b) and decreasing slope (c) were assumed to be as 12.5 kg, 0.1465 and 0.003 respectively. The values for lactation curve parameters were derived from the curve parameters of 305-day milk yield described in the study by Samaraweera et al (2020). For a given calving interval (CI, days), a lactation length (LL, days) of CI − 60 was assumed, with 60 days being the dry period.…”

Section: Derivation Of Economic Valuesmentioning

confidence: 99%

“…Over the past decades, the improvement in dairy cow milk production in Sri Lanka was mainly achieved via improving management conditions on‐farm and importing germplasm from other countries. There were numerous occasions where live animals were imported from temperate countries (Samaraweera et al., 2018 ; Vernooij et al., 2015 ). Studies showed a large genotype by environment interaction (Buvanendran & Petersen, 1980 ; Samaraweera et al., 2020 ), suggesting that genetic improvement of cows for the production systems in Sri Lanka should be identified via a local breeding programme rather than relying on selection in other countries.…”

Section: Introductionmentioning

confidence: 99%

“…Milk production, fertility traits and mastitis are important determinants of a successful dairy enterprise (Kadarmideen et al., 2003 ; Windig et al., 2006 ). The genetic parameters of milk production, udder health and fertility traits in temperate dairy cows in Sri Lanka have been previously estimated (Samaraweera, 2020 ; Samaraweera et al., 2020 ). In order to establish dairy cattle breeding programmes in Sri Lanka, it is important to estimate the economic benefits arising from genetic improvement of these important traits.…”

Section: Introductionmentioning

confidence: 99%

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Economic values for production, fertility and mastitis traits for temperate dairy cattle breeds in tropical Sri Lanka

Samaraweera

Werf

Boerner

et al. 2022

J Animal Breeding Genetics

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Economic values for annual milk yield (MY, kg), annual fat yield (FY, kg), annual protein yield (PY, kg), age at first calving (AFC, days), number of services per conception (NSC), calving interval (CI, days) and mastitis episodes (MS) were derived for temperate dairy cattle breeds in tropical Sri Lanka using a bio‐economic model. Economic values were calculated on a per cow per year basis. Derived economic values in rupees (LKR) for MY, FY and PY were 107, −162 and −15, while for AFC, NSC, CI and MS, economic values were −59, −270, −84 and −8,303. Economic values for FY and PY further decreased with higher feed prices, and a less negative economic value for FY was obtained with increased price for fat. Negative economic values for FY and PY show that genetic improvement for these traits is not economical due to the high feed costs and/or the insufficient payment for fat and protein. Therefore, revision of milk fat and protein payments is recommended. Furthermore, the breeding objective developed in this study was dominated by milk production and fertility traits. Adaptability and functional traits that are important in a temperate dairy cattle breeding programme in tropical Sri Lanka, such as longevity, feed efficiency, disease resistance and heat tolerance should be recorded to incorporate them in the breeding objective. Continued trait recording of all traits is recommended to ensure dairy cows can be selected more effectively in a tropical environment based on a breeding objective that also includes adaptability and functional traits.

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Heterogeneity of variance and genetic parameters for milk production in cattle, using Bayesian inference

Júnior

Fernandes

Panetto³

et al. 2023

PLoS ONE

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The goal of this study was to verify the effect of heterogeneity of variance (HV) on milk production in up to 305 days of lactation (L305) of daughters of Girolando, Gir and Holstein sires, as well as in the genetic evaluation of these sires and their progenies. in Brazil. The model included contemporary groups (consisting of herd, year and calving season) as a fixed effect, cow age at calving (linear and quadratic effects) and heterozygosity (linear effect) as covariates, in addition to the random effects of direct additive genetic and environmental, permanent and residual. The first analysis consisted of the single-trait animal model, with L305 records (disregarding HV). The second considered classes of standard deviations (SD): two-trait model including low and high classes (considering HV), according to the standardized means of L305 for herd-year of calving. The low SD class was composed of herds with SD equal to or less than zero and the high class with positive SD values. Estimates of (co)variance components and breeding values were obtained separately for each scenario using Bayesian inference via Gibbs sampling. Different heritability was estimated. Higher for the high DP class in the Gir (0.20) and Holstein (0.15) breeds, not occurring the same in the Girolando breed, with a lower value among the classes for the high DP (0.10). High values of genetic correlations were also found between low and high SD classes (0.88; 0.85 and 0.79) for the Girolando, Gir and Holstein breeds, respectively. Like the order correlations (Spearman) which were also high for the three breeds analyzed (equal to or above 0.92). Thus, the presence of HV had a smaller impact for L305 and did not affect the genetic evaluation of sires.

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Genetic parameters for milk yield in imported Jersey and Jersey-Friesian cows using daily milk records in Sri Lanka

Cited by 4 publications

References 35 publications

Effect of TMR Briquettes on Milk Production, Nutrient Digestibility, and Manure Excretions of Dairy Cows in the Dry Zone of Sri Lanka

Effect of TMR Briquettes on Milk Production, Nutrient Digestibility, and Manure Excretions of Dairy Cows in the Dry Zone of Sri Lanka

Economic values for production, fertility and mastitis traits for temperate dairy cattle breeds in tropical Sri Lanka

Heterogeneity of variance and genetic parameters for milk production in cattle, using Bayesian inference

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