Browsing Brage INN by Author "Heringstad, Bjørg"
Now showing items 1-7 of 7
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Associations between insulin-like factor 3, scrotal circumference and semen characteristics in young Norwegian Red bulls
Bremer, Joanna; Heringstad, Bjørg; Morrell, Jane M.; Kommisrud, Elisabeth (Peer reviewed; Journal article, 2023)With the integration of genomic selection in the cattle artificial insemination (AI) industry, bulls are selected for their semen production capacity and fertility at a younger age than previously. Norwegian Red bull calves ... -
Differences in sperm functionality and intracellular metabolites in Norwegian Red bulls of contrasting fertility
Narud, Birgitte; Klinkenberg, Geir; Khezri, Abdolrahman; Zeremichael, Teklu Tewoldebrhan; Stenseth, Else-Berit; Nordborg, Anna; Haukaas, Tonje Husby; Morrell, Jane; Heringstad, Bjørg; Myromslien, Frøydis Deinboll; Kommisrud, Elisabeth (Peer reviewed; Journal article, 2020-07-22)In the dairy breeding industry, prediction of bull fertility in artificial insemination (AI) is important for efficient and economically sustainable production. However, it is challenging to identify bulls with superior ... -
Novel interpretation of sperm stress test and morphology for maturity assessment of young Norwegian Red bulls
Bremer, Joanna; Heringstad, Bjørg; Morrell, Jane M.; Kommisrud, Elisabeth (Peer reviewed; Journal article, 2023)The use of genomic selection significantly reduces the age of dairy bulls entering semen production compared to progeny testing. The study aimed to identify early indicators that could be used for screening bulls during ... -
Ovarian Follicular Response to Oestrous Synchronisation and Induction of Ovulation in Norwegian Red Cattle
Berg, Halldor Felde; Heringstad, Bjørg; Alm-Kristiansen, Anne Hege; Kvale, Vilde Granne; Dragset, Knut Ingolf; Waldmann, Andres; Ropstad, Erik; Kommisrud, Elisabeth (Peer reviewed; Journal article, 2020)Oestrous synchronisation of cattle has been widely applied to accomplish simultaneous ovulation in animals and facilitate timed artificial insemination. The main aim of this study was to investigate the ovarian follicular ... -
Semen quality parameters including metabolites, sperm production traits and fertility in young Norwegian Red AI bulls
Narud, Birgitte; Khezri, Abdolrahman; Nordborg, Anna; Klinkenberg, Geir; Zeremichael, Teklu Tewoldebrhan; Stenseth, Else-Berit; Heringstad, Bjørg; Kommisrud, Elisabeth; Myromslien, Frøydis Deinboll (Peer reviewed; Journal article, 2022)Genomic selection in cattle breeding has gradually allowed younger bulls to be recruited for semen production. In this study, sperm quality parameters, seminal plasma and sperm metabolites, semen production capacity and ... -
Sperm chromatin integrity and DNA methylation in Norwegian Red bulls of contrasting fertility
Narud, Birgitte; Khezri, Abdolrahman; Zeremichael, Teklu Tewoldebrhan; Stenseth, Else-Berit; Heringstad, Bjørg; Johannisson, Anders; Morrell, Jane; Collas, Philippe; Myromslien, Frøydis Deinboll; Kommisrud, Elisabeth (Peer reviewed; Journal article, 2021)n this study, the complexity of chromatin integrity was investigated in frozen-thawed semen samples from 37 sires with contrasting fertility, expressed as 56-day non-return rates (NR56). Protamine deficiency, thiols, and ... -
Sperm quality, semen production, and fertility in young Norwegian Red bulls
Bremer, Joanna (Ph.d.-avhandling i anvendt økologi og bioteknologi;34, Doctoral thesis, 2023)Ved bruk av genomisk seleksjon i storfeavlen blir eliteokser selektert basert på deres estimerte genomiske avlsverdier i stedet for ved avkomsgransking. Oksene er derfor yngre når de blir tatt i bruk i sædproduksjon enn ...