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Showing 1 to 20 of 40 for “"lambing"”.
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Comparisons of spring and fall lambing programs in Kansas
Digitized by Kansas State University Libraries
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Reproductive performance of dorset ewes in the star accelerated lambing system
… ewes in the Cornell University STAR accelerated lambing program was evaluated. This program consists of five 30-d concurrent breeding and lambing periods per year beginning on January 1 (Sl), March 15 (S2), May 27 (S3), August 8 (S4) and October 20 (S5). Optimally, a ewe could lamb every 7.2 mo …
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An analysis of lambing ewes three times in two years in Southland
… the management and profitability of three lambings in two years under Southland conditions, and how they compare with those of a conventional Southland farming system. There has been little work done world wide but what overseas literature there is suggests that lambing ewes three times in …
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Budget analysis of quarter-Finn and Western ewes in spring- and fall-lambing systems
… fall (September). Effects of ewe breed type and lambing season on ewe fertility (ewes lambing/ewes exposed), prolificacy (lambs born/ewe lambing) and lambing date, and on lamb birth weight, 30-d survival, and average daily gain (ADG) to 55 d and to weaning were evaluated. Fertility was higher in …
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Budget Analysis of Spring, Fall with Winter Clean-up, and High-Fertility Fall Lambing Systems in a Simulated Fixed Forage Resource
… producers have the opportunity to choose which lambing system fits their existing operations and lifestyle. The use of economic analysis enables operator to make sound business management decisions. To compare different lambing systems (spring, fall with winter clean-up, and high-fertility fall) …
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The profitability of nitrogen fertiliser usage on Canterbury irrigated sheep farms
… and application rate, and was most apparent when lambing rate was increased to 140%. Spring applied nitrogen responses generally occurred too late to reduce the supplementation requirement. The increase in feed requirements which occurred when lambing rate increased from 120 to 140% could have …
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Selection to improve spring fertility in a crossbred sheep population
… was defined as the number of lambs born per ewe lambing. A total of 1,102 exposures were used. Fertility averaged .59 for adult ewes (3 years and older), .45 for second-lambing ewes and .11 for yearling ewes (12 months old). Mean litter size averaged 1.89 across seasons and ages. Scrotal …
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Characterization of seasonal reproduction in Virginia Tech Selection Line, St. Croix, and Suffolk ewes
… thought to be lowly seasonal. When January-lambing ewes were exposed to rams while lactating in April, significantly more OOS than St. Croix ewes were marked by rams in the first 21 d and total 39 d of ram exposure (58.3 vs. 8.7%, P = 0.0003 and 95.8 vs. 43.5%, P < 0.0001). Percentages of …
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ELUCIDATING DIFFERENT CLOSTRIDIUM PERFRINGENS TYPE D VACCINE PROTOCOLS IN EWES AND LAMBS
… study aimed to: (1) evaluate the effect of pre-lambing booster vaccination timing on ewe antibody responses and colostrum antibody transfer, (2) evaluate the transfer of passive immunity (TPI) in lambs, and (3) determine how lamb age at vaccination and maternal booster timing influence lamb …
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Induction of fertile estrus during seasonal anestrus in ewes and fall born ewe lambs
… d. Progesterone increased the percentage of ewes lambing to both service periods by 20 percentage points. Prolificacy to the first service period in ewes treated with FSH was greater than the prolificacy in control and all ewes lambing to the second service period. Treatment with P4 for 5 d was as …
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Occurrence, etiology and management of ringwomb in ewes
… seven years were observed over a period of five lambing seasons. The study was conducted on 24 clinical cases of ringwomb occurring in one flock. Ringwomb or incomplete cervical dilation accounted for an incidence of 20.5% (24/117) of all ewes lambing. The ewes affected were all daughters, …
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Effects of breed and ram exposure on Spring estrous behavior and Summer fertility in domestic ewes
… continuously throughout the 68 d or the study. Lambing date significantly affected mating behavior in H but not D ewes. The second study tested the effects of ram breed on incidence of mating and subsequent lambing in Rambouillet x Q Suffolk ewes In June and July of 1984 and 1985. Ewes were Q …
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Analysis of Inbreeding in a Closed Population of Crossbred Sheep
… had been randomly divided in 1987 into a fall-lambing selection line (S) of 125 ewes and 10 rams, fall-lambing environmental control line (E) of 55 ewes and 5 rams, and a spring-lambing genetic control line (G) of 45 ewes and 5 rams. Inbreeding effects were estimated from 2678 lambs and 556 …
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Lamb wastage and its association with ewe body condition
… where they were managed as one mob until pre-lambing in 2002, where the multiple bearing ewes remained for the following year’s trial (2003). Small-framed ewes in 2002 (n = 310) had significantly (P < 0.001) lower LW and GR (LW = 61.6 ± 0.73 kg; GR = 8.23 ± 0.26) compared with large-framed (n …
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Genetic evaluation of ewe productivity and its component traits in Katahdin and Polypay sheep
… and measures indicative of accelerated lambing performance. Genetic parameters were estimated for total weight of litter weaned per ewe lambing (TW) and its components, number of lambs born (NB), number of lambs weaned (NW) and average weight of lambs weaned (AW), measured as traits of …
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Sheep farmers and turkey vultures (Cathartes aura) in the Falkland Islands: from conflict to coexistence
… of vulture-sheep interactions during the 2008 lambing season (Sept. – Nov.). Half of farmers queried considered vultures a major threat to lambs, birthing ewes, and sheep that lie or fall down and are unable to get up (i.e., cast sheep). One of the forty-one farmers interviewed had personally …
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Melengestrol acetate and norgestomet for the induction of synchronized estrus in seasonally anovular ewes
… interval (P < .0001) from ram introduction to lambing. Fertility and prolificacy were not different for C, MGA, or 5MB ewes. Of the two progestogen treatments used alone, lambing rate was 85 and 59 % (P < .03) for OMGA and OSMB ewes, respectively. Ewes plimed with zeranol before MGA or 5MB …
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Management of Katahdin Hair Sheep
… of breeding BCS tended to be greater and lambing rates and frequency of multiple births were greater from continuous compared with 4-cell rotation. In experiment 2, 93 lambs (26 ± 0.5 kg initial BW; 96 d of age) were stratified by litter, BW, sex, and age of dam and were allocated randomly …
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Linear programming applied to a forage based cattle and sheep production system on a demonstration farm
… Seventy three fall calving cows and 152 winter lambing ewes were in the optimal plan. The ratio of fall calving cows to winter lambing ewes was 1 : 2. Stocking ratios between cows and ewes were dependent upon price relationships used and could vary with differing price relationships between …
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Bacteriology of the reproductive tract of the peri parturient ewe and its relationship with fertility
… This discharge lasted for up to 7-8 days after lambing. Ewes were clinically normal with rectal temperatures between 39.1C adn 39.6C. White to brownish, watery discharge with a foetid smell was designated Type 2. Affected ewes had rectal temperatures of 39.9C ti 41.5C. The most severe discharge …
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