A5034977483- Reproductive Physiology in Livestock
- Genetic and phenotypic traits in livestock
- Ruminant Nutrition and Digestive Physiology
- Milk Quality and Mastitis in Dairy Cows
- Genetic Mapping and Diversity in Plants and Animals
- Reproductive Biology and Fertility
- Animal Behavior and Reproduction
- Meat and Animal Product Quality
- Animal Behavior and Welfare Studies
- Animal Nutrition and Physiology
Swedish University of Agricultural Sciences
2019-2023
Bahir Dar University
2019
Improved potential for weight gain and carcass classification traits in calves aimed at slaughter from dairy herds would increase the calves' economic value, enable an increased beef production. At present, relatively low weights are placed on comprehensive Nordic cattle breeding goal. An effective way to improve production is therefore inseminate a larger proportion of heifers cows with bull semen. In choice breed, both effects calving traits, need be considered. The aim this study was...
This study examined the feasibility of using pregnancy-associated glycoproteins (PAG) in milk within breeding for pregnancy maintenance and assessed genetic variation loss traits. A total 374,206 PAG samples from 41,889 Swedish Red (SR) 82,187 Holstein (SH) cows were collected at monthly test-day milkings 1,119 herds. Pregnancy status was defined based on levels confirmed by data artificial insemination (AI), calving, culling d 1 postinsemination to calving. traits as embryonic (diagnosed 28...
In a study aiming to identify candidate genomic regions associated with endocrine and classical fertility traits in Swedish Red (SR) Holstein cows, data on 3955 lactations 1164 SR 1672 cows were examined. The dataset comprised milk progesterone (P4) levels (n = 341,212) 14 herds, automatically collected analyzed in-line using the DeLaval Herd Navigator™. Endocrine studied were: days from calving commencement of luteal activity (C-LA), first phase length (LPL), inter-luteal interval,...
This study assessed the extent of reproductive losses and associated genetic parameters in dairy cattle, using in-line milk progesterone records for 14 Swedish herds collected by DeLaval's Herd Navigator. A total 330,071 samples were linked to 10,219 inseminations (AI) from 5,238 lactations 1,457 Red 1,847 Holstein cows. Pregnancy loss traits defined as early embryonic (1–24 d after AI), late (25–41 fetal (42 AI until calving), pregnancy (from 1 calving). The following classical fertility...
The effect of carrier status 10 lethal recessive genetic defects on pregnancy maintenance in Swedish dairy cattle was examined. were: Ayrshire Haplotype 1, 2, Bos taurus autosome 12 (BTA12), 23, and Brown Swiss 2 Red Dairy Cattle (RDC), Holstein 3, 4, 6, 7 (HH1-HH7) Holstein. Effects BTA12 HH3 conception rate (CR), interval from first to last service (FLS), milk production were also Data obtained for 1,429 herds the recording system, while information Nordic Genetic Evaluation. In total,...
This study investigated activity, preferred pen location and social interactions in female piglets (0–10 weeks of age, N = 98) intended for breeding. Piglets were housed pens where the sow loose-housed without (CP) or with access to neighbouring week 2–5 (AP). Female two genetic lines (Dutch Swedish Yorkshire (DY, SY)) from 26 litters selected within 24 h after birth. DY AP treatment spent more time than SY (24.0% vs 19.0%), while both less lying down before weaning CP. At weaning, CP...