Abstract This study reports genetic parameters for yearling and adult wool growth traits, ewe reproductive performance. Data were sourced from an Uruguayan Merino flock involved in a long-term selection program focused on reduced fiber diameter (FD), increased clean fleece weight (CFW) live (LW). Pedigree performance data approximately 5,700 mixed-sex lambs 2,000 mixed-age ewes born between 1999 2019 analyzed. The number of records ranged 1,267 to 5,738 1,931 7,079 productive LW body...

ABSTRACT Genetic trends were estimated for production and reproduction traits in an Uruguayan Merino genetic nucleus. Two consecutive periods with different selection objectives studied. During the first period (1999–2010), objective of this flock focused on reducing fibre diameter (FD), while allowing a slight loss clean fleece weight (CFW). From 2011 to 2018, breeding was shifted then maintaining FD, increasing both CFW live (LW). Data from approximately 5380 yearling lambs 2000 ewes born...

This study tested the hypothesis that ewes bearing single or twin lambs shorn at 70 120 days of pregnancy would give birth to more vigorous than those born unshorn ewes, increasing chances lamb survival. was in two experiments. In first, 57 adult Corriedale were allocated three treatments; shearing Day gestation (S70, n = 18), (S120, 19) (US, 20). second, twins same treatments: S70, 18; S120, 20; US, 19. All grazed native pasture until penned and fed individually requirements during last 10...

The evaluation of sheep feed intake (FI) in efficiency tests is expensive. Decreasing the test period could be a resource-saving tool by reducing cost evaluating each animal and allowing to greater number animals per year. For this reason, objective research was explore residual (RFI) models decreasing duration. Data collected from 286 Australian Merino three performed trials, consisted 56 days (14 facilities adaptation 42 FI average daily gain (ADG) evaluation). Two were used calculate RFI,...

In the last two decades, major changes in international market for wool and sheep meat have been observed, resulting from textile consumption patterns. These influenced way that products are produced, industrialized commercialized, particularly those countries historically exported majority of their production to market. Improvement productivity, efficiency, competitiveness alternative industries (e.g., synthetic fabrics, cotton, pork, poultry), business scale, trade agreements, negative...

During a four-year period, mature ewes were either shorn in mid-pregnancy or post-partum to study impacts on lamb live weight and survival. Furthermore, placental measurements collected from subset of single-bearing yearly fleece weights wool samples single- twin-bearing ewes. Lambs born heavier (p < .05) displayed greater survival than those regardless litter size. Shearing treatment had no effect > the placenta, diameter cotyledons. However, number cotyledons was Ewes produced lighter...

Small ruminant farming is of socio-economic and environmental importance to many rural communities around the world. The SMARTER H2020 project aims redefine genetic selection criteria increase sustainability sector. objective this study was analyse breeding management practices small producers breeders, linked with socio-technical elements that shape them. based on farm surveys using semi-structured interviews conducted in five countries (France, Spain, Italy, Greece, Uruguay) across 272...

Ninety-six Hereford cow-calf pairs grazing Campo grasslands were used in a 2 × factorial design that evaluated stocking rate (high [H] vs low [L]) and creep feeding (CF; yes or no). Creep-fed calves L had greater average daily gain (1.07 ± 0.03 kg/d) than CF H (0.96 kg/d; P < 0.05), but − (0.78 (0.73 similar gains (P > 0.05). Similarly, + heavier at weaning (172 3 kg) (160 kg), weights between (144 (138 kg; 0.05) did not differ. grazed less (39 10%) non-supplemented (58 15%; Creep no effect...

Contents This study compared the effect of different management systems on endocrine parameters, and gene expression members somatotrophic axis in liver endometrium beef heifers. Twenty‐two 709‐days‐old heifers submitted to Early Weaning ( EW , n = 8), Traditional TW 7) plus creep feeding + CF were used. Animals synchronized with two prostaglandin PG ) injections at 11‐day interval (Oestrus Day 0). Blood samples collected daily for progesterone (P4) determination, endometrial biopsies Days 7...

This study reports the phenotypic trends for wool, growth, and reproductive traits in mixed-age ewes after twenty years of genetic selection. Data were obtained from Merino nucleus flock Uruguay between 1999 2020. Overall, aim this selection was to reduce fiber diameter (FD) increase both clean fleece weight (CFW) live (LW). on ewe wool traits, LW, body condition score (BCS), total number lambs weaned (TLW), LW (TWW) across all lambing opportunities (1–8 mating seasons) analyzed. Between...

Sheep selected for high wool growth were previously shown to exhibit higher microbial protein outflow from the rumen and uptake of amino nitrogen in portal blood than those low growth. This suggests that genetic selection may induce changes foregut physiology. study was undertaken determine whether differences digesta kinetics, especially mean retention mime (MRT), are associated with fleece production between sheep or estimated breeding values (EBVs) weight. Twenty mature Merino wethers...

Context It has been indicated that there might be an antagonism between selection for gastrointestinal nematode resistance and high productivity feed conversion efficiency in ruminants. Aims This study aimed to determine whether genetic nematodes would alter the intake of sheep with or without infection Haemonchus contortus. Methods Sixty-seven Corriedale lambs (357 ± 14 days old) derived from flocks genetically selected resistant (n= 29) susceptible (n = 38) (GIN) were evaluated individual...

This study evaluated the phenotypic trends for wool and growth traits of fine Merino genetic nucleus in Uruguay. Data were collected from one-year-old lambs over a twenty-year period (1999–2018). The overall aim selection flock was to reduce fiber diameter with concomitant increases fleece live weights. Traits analyzed included (FD), greasy weight (GFW), coefficient variation FD (CVfd), staple length (SL), scoured yield (SY), post-shearing (LW), eye muscle area (EMA) fat thickness (FAT)....

To evaluate the impact of feeding rams for 14 weeks with legumes and supplement on their clinical, behavioural endocrine responses, 32 Merino rams, 17 months old, were allocated to four groups (n = 8). The 2 × factorial arrangement evaluated pasture type (IP, improved pasture; NP, native pasture) effect (+S) or not (–S) a supplement. Every liveweight, scrotal circumference serving capacity blood samples taken measure concentrations metabolites metabolic hormones. Grazing behaviour was every...