Genetic parameters of blood urea nitrogen and milk urea nitrogen concentration in dairy cattle managed in pasture-based production systems of New Zealand and Australia
نویسندگان
چکیده
Context Urinary nitrogen excretion by grazing cattle causes environmental pollution. Selecting for cows with a lower concentration of urinary may reduce the impact. While is difficult to measure, blood urea (BUN), mid-infrared spectroscopy (MIR)-predicted BUN (MBUN), which predicted from MIR spectra measured on milk samples, and (MUN) are potential indicator traits. Australia New Zealand have increasing datasets records, 18 120 15 754 records in respectively. A collaboration between could further increase size dataset sharing data. Aims Our aims were estimate genetic parameters traits within country, correlations countries gauge benefit having joint reference population genomic prediction an trait that potentially suitable selection both countries. Methods Genetic estimated country (Australia Zealand) Holstein, Jersey multibreed population, BUN, MBUN MUN Zealand, using high-density genotypes. also recorded Zealand. Analyses used first record available each cow or days-in-milk (DIM) intervals. Key results Heritabilities ranged 0.08 0.32 various Higher heritabilities obtained than Australian cows. highly correlated (0.71–0.94), small moderate (0.08–0.58). Conclusions showed heritability differs among trait, breed, country. only low moderate. Implications Further study required identify underlying difference observed, compare accuracies different populations, other such as fertility feed intake. Larger help more accurately
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ژورنال
عنوان ژورنال: Animal Production Science
سال: 2021
ISSN: ['1836-5787', '1836-0939']
DOI: https://doi.org/10.1071/an21049