Data Holstein breedings from 2006 through 2008 Total breedings

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Presentation transcript:

Effect of sexed semen on conception rate, calf sex, dystocia, and stillbirth

Data Holstein breedings from 2006 through 2008 Total breedings 1,105,913 heifer matings 9,778,629 cow matings Marketing code 514 was not included 2

Extent of sexed-semen usage Year of Breeding Conventional Semen Sexed-Semen Number % Heifer Breedings 2006 369,213 98 5,559 2 2007 368,406 90 41,236 10 2008 241,727 82 53,905 18 Cow Breedings 2,476,780 100 2,015 0.1 4,097,359 7,974 0.2 3,182,479 12,016 0.4

Heifer breedings by service number % of Total Breedings % Sexed Semen Breedings Conventional Sexed 1 56 8 82 2 21 14 3 4 5 6 7

Heifer breedings by service number Conception Rate (%) Conventional Sexed 1 60 44 2 56 37 3 51 33 4 47 30 5 42 27 6 36 23 7 28 14 Overall mean CR of 42% for sexed-semen

Cow breedings using sexed-semen % Sexed-Semen Breedings Service Number Lactation Number 1 2 3 4 5 43 14 7 11 When comparing to the number of total matings, there is <1% sexed-semen breedings for every service number in each lactation

Cow breedings using sexed-semen Conception Rate (%) Service Number Lactation Number 1 2 3 4 5 Conventional Semen 35 31 30 28 26 33 29 Sexed-Semen 25 21 24 22 20 11 23 Overall mean CR of 25% for sexed-semen

Calf sex Calf Sex Heifer Breedings (%) Cow Breedings (%) Conventional Sexed Single Females 50 90 45 85 Single Males 49 9 11 Twins 1 5

Incidence of Dystocia Calf Sex Heifer (%) Cow (%) Conventional Sexed Single Females 4 2 1 Single Males 8 9 3 Twins 5

Incidence of Stillbirth Calf Sex Heifer (%) Cow (%) Conventional Sexed Single Females 9 10 4 3 Single Males 11 15 Twins 13 8 Significant difference in heifers when single males were born when comparing conventional to sexed semen

Conclusion Trends show increasing usage since 2006, when sexed semen became commercially available Farmers are using sexed semen in heifers and first service inseminations for cows, when conception rates are traditionally higher 90% heifer calves when using sexed semen No increase incidence of dystocia Some significance when males calves are born with sexed semen 11