Fewer and fewer hereditary defects in Canadian Holsteins

Frozen Bone-In Beef
Market & Price Trends
Published Feb 13, 2024

Tridge summary

The Canadian Holstein population has seen a significant reduction in hereditary defects and lethal haplotypes, according to Lactanet data. In 2010, nearly 8% of calves were carriers of the hereditary brachyspina defect, but this figure dropped to around 1% by 2023. Other hereditary defects such as CVM and leaf have also significantly decreased. The presence of lethal haplotypes, which can cause embryonic mortality, has sharply declined. This positive trend is attributed to genome research, enabling early detection of carriers and preventing matings between them.
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Original content

The percentage of carriers of hereditary defects and lethal haplotypes in the Canadian Holstein population has fallen sharply in recent years. This is evident from figures from the Canadian livestock improvement organization Lactanet. CVM and magazine only sporadically In 2010, for example, almost eight percent of calves born were still carriers of the hereditary brachyspina defect. In 2023, the percentage of calves identified as brachyspina carriers was only approximately 1 percent. The presence in the population of hereditary defects such as CVM and leaf has also decreased significantly in recent years. Last year, the genes responsible for these defects were only found sporadically. Also less lethal haplotypes The presence of so-called lethal haplotypes, genetic defects that can cause embryonic mortality, has also declined sharply in the Canadian Holstein population. The haplotypes HH1 to HH4 were only found in approximately two percent of the heifer calves born in 2023. The ...
Source: Veeteelt
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