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Call number: LD2668 .T4 1986 N484 / Master of Science / Animal Sciences and Industry

Typescript (photocopy). / Thesis submitted under title: Biochemical aspects of early pregnancy in the pig; but doctorate conferred to title: Biochemical aspects of early pregnancy in the sow / Includes bibliographical references (leaves 178-205) and list of personal publications related to pig physiology (leaves vi-vii) / Roseworthy Library copy has original title. / xi, 205 leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Examines aspects of early pregnancy in pigs, aimed to identify determinants of the high level of embryonic mortality which occurs prior to implantation / Thesis (Ph.D.)--University of Adelaide, Dept. of Obstetrics and Gynaecology,1985

Graduation date: 1992

Purpose of the study: to assess chlorella impact on productivity of sows and on speed of piglets’ growth. This research of master degree was accomplished in 2004-2006 in Animal Nutrition Department of Lithuanian Veterinary Academy, in feed research laboratories of Agrochemical Investigations Centre of Lithuanian Institute of Agriculture and joint stock company AB “Kauno Grūdai“ and in breeding-ground of farmer G. Charitonovas (Žadeikonių village, Pasvalio region) with the swine of the Swedish Yorkshire breed of the first group. Research revealed that: 1. during suckling period mass reduction in sows, that were given a suspension of chorella during pregnancy period, was lower by 14.5% compared to the control group containing sows that were fed by combined feeds only (p<0.05); 2. prolificacy of the test group sows was by 10.0% higher (p>0.05), piglets produced by them were 9.6% heavier (p<0.05) and families of born piglets where less varied when compared to the control group; 3. sows of the test group that were given a suspension of chorella were by 10.98 kg or 22.4% milkier when compared to the sows of control group (p<0.05); 4. chorella had a positive impact on change of piglets mass: piglets at birth were by 9.6%, on the 21st day of life – by 8.4%, on the 35th day of life, i.e. at the wean off – by 7.6% heavier when compared to the piglets of control group (p<0.05); 5. in the test group retention of piglets was as follows: on the 10th day of life – by 2.2%, on the 21st day... [to full text]

Objective – To evaluate the correlation of sows removing genotype and farm conditions on the reproduction indicators. Research goals: 1. To analyse genotype and farm conditions influence to researching reproductions indicators of the sows; 2. To evaluate the influence of sows removing genotype and farm conditions on the reproduction indicators; 3. To evaluate removals reasons correlation with sows reproductions indicators. Research methods: The aim of the study was to evaluate how parameters of lifetime productivity differ for females having distinct removal reasons and was to describe the reasons for removal of sows distributed across parity categories data analysis was done with Microsoft Excel 2000 program. We have calculated research attribute medium values and bias (SE). Using general linear model we have investigated (genotype, farm and condeming reasons) fact influens for research reproduction index. Reproduction problems and diseases represented two third of all removals. Too early sows removing is one of the determinative factor which decreasing pigs drove reproduction and farm profitability.

Apibendrinant literatūros apžvalgoje minėtus faktus yra aišku, jog mokslas įsiterpia į tiriamą problemą. Straipsnių, susijusių su reprodukcijos sutrikimų tyrimais, skaičius nuolat didėja. Galbūt dėl to, kad ES skiria daug dėmesio žemės ūkio plėtrai, galbūt konkurencingumas verčia ūkininkus nemažai lėšų skirti tyrimams, susietiems su reprodukcijos problemos išaiškinimu ir jos panaikinimu. Tyrimai atliekami visame pasaulyje, o atskirus rezultatus bandoma susisteminti, keliant įvairias hipotezes. Su ūkiu susijusios problemos sprendžiamos pasitelkiant architektus ūkio planavimui, oro ventiliavimo ir kondicionavimo, apšvietinimo bei kitus specialistus. Tačiau kaip stengiamasi išvengti problemų jų nuolat atsiranda. Iš išskirtų faktorių, įtakojančių paršavedės reprodukcinį pajėgumą, sezoniškumas yra bene svarbiausias elementas, o su juo susiję sutrikimai kelia nemažai diskusijų. Pagal gautus tyrimo rezultatus galime teigti, kad vasarą, esant aukštoms temperatūroms bei ilgam šviesos režimui, būtina keisti ūkinio pastato konstrukcijas, kad neužtrūktų kiaulaičių brendimo laikas. Sėkmingai reprodukcijos eigai keliami dideli reikalavimai: reikalingas kompetetingas personalas, aplinkos veiksnių kontrolė, dokumentavimas bei protokolavimias, atsakingumas ir kruopštumas. Apžvelgiant tyrimų rezultatus pagrindiniai paršavedės reprodukcinių savybių rodikliai žiemos sezono metu buvo geresni nei vasaros (vislumas 4,36 proc., pieningumas 7,7 proc., nujunkomo lizdo masė 8,57 proc. didesni)... [toliau žr. visą tekstą] / Summarizing the facts mentioned in the literature review it is obvious that science intervenes to the researched problem. The number of articles where the disorders of reproduction are researched is increasing. The reasons can be the big attention from EU to the development of agriculture, the fact that competitiveness makes the farmers to spend quite a lot of money on researches where the problems of reproduction are being explained and the ways to eliminate it are proposed. The researches are done all over the world and separate results are systemized, various hypotheses are being formed. Farm related problems are being solved with the help of architects to plan the farm, as well as the specialists of air ventilation and conditioning, illumination and other fields. But even if we try to avoid problems they occur. Among the highlighted factors influencing the reproduction capacities of sow, factor of seasons is almost the most important element, and the disorders related with it raise a lot of discussions. The light regime virtually doesn’t affect the reproduction capacities under the high temperature, so the heat stays the main reason of summer time infertility. Talking about the influence of seasons to the interval of weaning until the rutting it can be stated that in the optimal combination of air temperature and photoperiod, the reproduction capacities can be stimulated; however each factor separately can inhibit the reproduction. The results of this research shows that... [to full text]

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2007. / Härtill 4 uppsatser.

The goal of the thesis was to analyse the reproductive performance of sows at a selected farm during years of 2011 - 2015. As a main performance indicator we picked a number of live born piglets per sow and litter. Average number of born alive piglets per litter was 12.54. Highest average was reached by Large White breed with 12.70 piglets in a single parity. Highest average over observed period occurred in 2012 with 13.07 live born piglets. Most productive month was May with 12.81 piglets per parity.First parity produced least amount of piglets (11.94), this metric increased until 4th litter to 13.11, and since 5th parity the parity number slowly decreased. Sows with a shorter farrowing interval (under 145 days) exhibited slightly lower fertility than sows with a longer interval (12.64 and 12.75 live born piglets/parity respectively), the difference being 0.11 piglets per sow. Measuring the effect of length of weaning-to-conception interval, sows with interval of 5 or less days produced more live-born piglets per parity (12.69) than sows with interval of 6 and more days (12.55). As for effect of gestation length, sows with shorter gestation (114 days or less) farrowed more piglets (13.10) than sows with longer gestation (115 days and more 12.14 piglets). Examining gilts, the ones mated in earlier age (under 8.3 months) had smaller average litter size of 11.80 piglets vs. 12.29 piglets for gilts mated after 8.3 months. For 92.05 % of observed sows, a single mating was sufficient, and these had higher farrowing rate of 12.55 vs. 12.35 for sows requiring repeated mating.