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1.
Genetic differences between Upton-Meishan (UM, n = 13) and Large White (LW, n = 14) gilts were studied with regard to mammary gland development and concentrations of hormones. Gilts were weighed and their backfat measured at mating, and at d 70 and 109 of gestation. Jugular blood samples were also collected at these times and assayed for prolactin, cortisol, IGF-I, insulin, glucose, progesterone, and estradiol. Gilts were slaughtered on d 110 of gestation. One row of mammary glands was used for dissection and biochemical analyses. The other row was used for determination of prolactin receptor number and affinity. UM gilts weighed less (P<0.05) and had more backfat (P<0.01) than LW gilts at all times. Parenchymal tissue weight was less (P<0.05) in UM gilts. Percent fat (P<0.001) and dry matter (P<0.001) in parenchymal tissue were greater in UM gilts while that of protein (P<0.001) was lower. Total protein weight in parenchyma was also lower in parenchyma was also lower in UM gilts (P = 0.01). Both DNA (P<0.001) and RNA (P<0.001) contents were lower in UM gilts while RNA/DNA remained similar (P>0.1). Number of prolactin receptors were lower (P = 0.06) and affinity greater (P<0.05) in UM gilts. Cortisol levels were greater (P<0.01) in UM gilts while other hormones were not affected (P> 0.1). Results clearly demonstrate genetic differences with regard to mammogenesis in gilts and suggest that the less mammary gland development in Upton-Meishan compared with Large White breed of gilts may be related to lower number of prolactin receptors. 相似文献
2.
In 11 'farrow-to-finish' outdoor or indoor production units, blood samples from late pregnant gilts were tested by indirect immunofluorescence antibody (IFA) serum assay for Lawsonia intracellularis. The offspring of positively tested gilts were tested at 2, 7, 12, 17, 22 and 27 weeks of age for seroprevalence of Lawsonia intracellularis. All offspring of IFA positive gilts were seronegative at 2 and 7 weeks of age. At 12 weeks of age 81.0% of indoor and 51.0% of outdoor pigs were tested positive. While at 17 weeks of age 82.5% of indoor-raised pigs showed seropositivity, in outdoor units the seropositivity declined to 31.3%. At weeks 22 and 27 indoor-raised pigs still showed marked seropositivity (17.7% and 11.5%) but their outdoor-raised counterparts revealed declining values (7.4% and 0%). 相似文献
3.
This study was done in a large Croatian pig-production unit. Blood samples from late-pregnancy gilts were tested by an indirect immunofluorescence-antibody (IFA) serum assay for Lawsonia intracellularis (LI). Ten IFA-positive and 10 IFA-negative gilts were selected. The 2-week-old piglets (97 from positive gilts, and 98 from negative gilts) were inoculated intragastrically with pure culture of LI. All pigs were tested until slaughter for seroprevalence of LI. Blood samples were collected at 5, 8, 11, 14, 17, 20, 23 and 26 weeks of age. Seropositivity in offspring of IFA-negative gilts was highest at age 5 weeks (84%) and declined gradually from week 11 to only 10% at week 26. At the same time, the offspring of IFA-positive gilts showed lower and faster-decaying seroprevalence: only 32% at week 5 and 0% starting at week 17. There was no difference in the pen-days of diarrhoea between the offspring of LI-seropositive and -seronegative gilts. 相似文献
4.
The study was performed in a large Croatian production unit from May 2000 till June 2002. Blood samples form late-pregnant gilts were tested by indirect immunofluorescence antibody (IFA) serum assay for Lawsonia intracellularis. The offspring of 301 positively tested gilts were dislocated after the nursery phase either to indoor or outdoor growing-finishing facilities. Ten percent of these animals (142 indoor, 143 outdoor raised pigs) were tested at 2, 6, 10, 14, 18, 22 and 26 weeks of age for seroprevalence of Lawsonia intracellularis. All offspring of IFA positive gilts were seronegative at 2 and 6 weeks of age. At 10 weeks of age 71.1% (101 animals) of indoor and 32.8% (47 animals) of outdoor pigs were tested positive (P < 0.05). While at 14 weeks of age 71.1% of indoor raised pigs showed seropositivity, the seropositivity declined in outdoor units to 7.6% (P < 0.01). At weeks 18 (52.1%), 22 (47.8%) and 26 (21.7%) indoor raised pigs still showed marked seropositivity and but their outdoor raised counterparts returned to seronegativity. 相似文献
5.
OBJECTIVE: To determine change over time in sero-prevalence of antibodies against Lawsonia intracellularis among growing-finishing pigs housed in indoor versus outdoor facilities. DESIGN: Serologic survey. ANIMALS: 93 pigs born to seropositive gilts and raised in indoor (n = 49) or outdoor (44) growing-finishing facilities. PROCEDURE: Blood samples were collected from the pigs 2, 6, 10, 14, 18, 22, and 26 weeks after birth and tested for antibodies against L intracellularis with an indirect immunofluorescence assay. RESULTS: None of the pigs were seropositive 2 or 6 weeks after birth.Ten weeks after birth, 74% and 76% of pigs in indoor and outdoor growing-finishing facilities were seropositive, respectively, whereas 14 weeks after birth, the percentage of pigs in indoor growing-finishing facilities that were seropositive was substantially higher than the percentage of pigs in outdoor facilities that were. From 18 weeks after birth to the end of the study, none of the pigs in outdoor growing-finishing facilities were seropositive, whereas low percentages of pigs in indoor facilities were seropositive 18, 22, and 26 weeks after birth. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that seroprevalence of antibodies against L intracellularis decreases faster among growing-finishing pigs housed in outdoor facilities than among growing-finishing pigs housed in indoor facilities. 相似文献
6.
This study was designed to evaluate the efficacy of an inactivated vaccine based on a European-type strain of porcine reproductive and respiratory syndrome virus (PRRSV) against the reproductive form of the syndrome in breeding gilts, and any congenital disease in their piglets. Five gilts were vaccinated twice, following the manufacturer's instructions, before they were inseminated. Nine additional gilts remained unvaccinated and served as positive (five gilts) and negative (four gilts) controls. A European wild-type strain genetically divergent from the vaccine strain was used to challenge the five vaccinated and five unvaccinated positive control gilts at 90 days' gestation. The vaccination of the five seronegative gilts did not produce any clinical signs or adverse reactions. However, the vaccine failed to prevent the clinical signs associated with PRRSV infection, viraemia after the challenge and transplacental infection of their piglets. The reproductive performance of the vaccinated gilts was similar to that of the unvaccinated positive controls, and there were no statistically significant differences in most of the parameters tested. However, the preweaning mortality of the piglets born to the vaccinated gilts was significantly lower than that of the piglets born to the positive control gilts. 相似文献
7.
Herbst W Willems H Baljer G 《Berliner und Münchener tier?rztliche Wochenschrift》2004,117(11-12):493-498
Although Brachyspira (B.) hyodysenteriae and Lawsonia (L.) intracellularis are widely distributed in pigs in Germany, there exists limited information on their clinical relevance.To get more insight into their potential role in swine diarrhoeal disease, in 2002 and 2003 faecal specimens from healthy pigs (n=1445) as well as from diarrhoeic pigs (n=2002) were tested by polymerase chain reaction (PCR) for the presence of both agents. Of the specimens from healthy pigs L. intracellularis and B. hyodysenteriae were detected in 7.3% and 6.7%, respectively. In contrast, of the diarrhoeic pigs the ratios of positive samples amounted to 19.4% for L. intracellularis and 17.9% for B. hyodysenteriae. Concerning the age of the diseased animals, in growing pigs the detection rates of L. intracellularis and B. hyodysenteriae were nearly identical (16.4% and 14.2%, respectively). In fattening pigs a significant higher number of animals were affected with B. hyodysenteriae (35.8%) than with L. intracellularis (28.2%). On the other hand, in sows L. intracellularis (35.6% positive samples) was dominant compared to B. hyodysenteriae (21.2% positive samples). Considering the nearly threefold higher percentage rates of L. intracellularis and B. hyodysenteriae in diarrhoeic pigs in comparison to healthy pigs, it is concluded that both agents play an important role in swine diarrhoeal disease. The results further indicated that in fattening pigs B. hyodysenteriae and in sows L. intracellularis have a dominant role, respectively. 相似文献
8.
Z.-G. Miao L.-J. Wang F. Zhu G.-W. Li 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(4):179-185
Abstract The activities of amylase, trypsin and lipase in pancreas and the activity of pepsin in cardiac mucosa were measured in Jinhua and Landrace gilts at 35, 80 and 125 days of age, respectively. Jinhua gilts had lower total trypsin and total pepsin activities compared with Landrace gilts (P<0.01), and lower pepsin activity (per g of cardiac mucosa) at 80 days (P<0.05) and 125 days of age (P<0.01). In contrast, Jinhua gilts had higher amylase activity (per g of pancreas) and lipase activity (per kg of empty body weight) compared with Landrace gilts (P<0.001), and higher total amylase activity at 35 days (P<0.05) and 125 days (P<0.01) of age. Jinhua gilts had higher lipase activity (per g of pancreas) at 35 days (P<0.05), 80 days (P<0.01) and 125 (P<0.001) days of age. 相似文献
9.
Re-serviced females on commercial swine breeding farms 总被引：1，自引：0，他引：1
Koketsu Y 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(12):1287-1291
The objectives of this study were to observe subsequent reproductive performance of re-serviced females by the number of services within a parity, to measure mean days to re-service and culling intervals, to determine lifetime performance in re-serviced gilts, and to investigate re-serviced females across parities on commercial farms. Reproduction records on 539 U.S.A. farms were used to observe re-serviced females by the number of service groups at the herd level. Farrowing rate decreases by approximately 10%, and re-service occurrence increases by approximately 5% for each increase in the number of services increase within a parity group (P<0.05). Only in parity 0 to 2 groups, average pigs born alive at subsequent farrowing in the second or later service groups were greater than in the first service group (P<0.05), but in parity >or=3, the third or later service groups produced fewer pigs born alive than the other service groups (P<0.05). Lifetime performance and re-service events were observed in 39945 individual females on the 149 selected farms that had complete 5-year records. Means of days to re-service, first-mating-to-culling intervals in gilts and weaning-to-culling intervals in sows were 46.3 days, 95.2 days, and 48.2 days, respectively. Re-serviced gilts had longer NPD (>50 days), a lower parity at culling (>0.5) and fewer lifetime pigs born alive (>2 pigs) than non-return gilts (P<0.05), but no difference in average pigs born alive per parity was found between re-serviced gilt groups and non-return gilts. Of 19677 re-serviced females, 35.6% had two or more re-services across parities in pig life, 10.6% had 3 or more re-services, and 1.95% had four or more re-services. Accurate estrus detection with a boar and improved mating techniques on re-serviced females are suggested to improve herd productivity. 相似文献
10.
试验旨在研究氯前列醇钠、产前背膘厚、便秘对后备母猪同期分娩集中度和生产性能的影响,并进一步探讨母猪同期分娩的最优方案。选取后备母猪共295头,根据妊娠期110 d时P2点处的背膘厚,随机分为3组：对照组（CON组：0.9%生理盐水）、低剂量氯前列醇钠组（LPG组：0.1 mg氯前列醇钠）、高剂量氯前列醇钠组（HPG组：0.2 mg氯前列醇钠）,于妊娠期114 d进行阴户部注射诱导分娩。结果表明,与对照组相比,高、低剂量氯前列醇钠均可显著缩短母猪从注射到分娩的时间间隔（P<0.05）,且两试验组间差异不显著（P>0.05）。但是,LPG组后备母猪在注射氯前列醇钠后48 h内的分娩率高达95%,并且白天分娩率达75.7%。此外,LPG组后备母猪的产仔间隔也显著短于CON组（P<0.05）。同时本研究发现,背膘厚在16~20 mm范围内的后备母猪从注射到分娩的时间间隔显著短于背膘厚≤15 mm的后备母猪（P<0.05）;便秘指数0~1.0组后备母猪的产程和产仔间隔均显著大于便秘指数1.1~2.0组及2.1~3.0组的后备母猪（P<0.05）。进一步回归分析发现,母猪背膘厚分别与产程、总产仔数、活仔数存在极显著线性相关（P<0.01）,母猪便秘指数分别与产程、产仔间隔、总产仔数、活仔数存在极显著线性相关（P<0.01）。综上所述,在妊娠期114 d对后备母猪阴户部注射0.1 mg氯前列醇钠诱导分娩,不仅可显著加快母猪分娩的进程,而且还可大大节约药物成本。此外,母猪产前背膘厚和便秘均会影响母猪同期分娩的效果,应使母猪分娩前保持最佳的背膘厚（16~20 mm）,且避免母猪便秘,方可保证同期分娩的顺利实施。 相似文献
11.
Sixty-four crossbred gilts were used to study the effect of mating at the first oestrus period following puberty. Puberty was induced at different ages by the introduction of the gilts to boars at either 160 or 200 days of age. Mating was delayed until second oestrus, when the mean age of the two groups was 197.8 and 237.2 days respectively. The difference of 39.4 ± 5.14 days was significant (P < 0.001). There were no significant differences in the number of weight of pigs born or reared in any of the first five parities. Thirty four sows (seventeen from each treatment) completed five parities. The gilts mated at 237 days of age consumed 159 ± 38 kg (P < 0.01) more food between 160 days of age and weaning their fifth litters. The gilts mated at the younger age consumed 6.2% less food per unit of weaner liveweight over the five litters. Initial differences in liveweight between the two groups had disappeared by the middle of the second pregnancy. 相似文献
12.
Roberto M C Guedes Connie J Gebhart 《Journal of veterinary diagnostic investigation》2003,15(5):438-446
Proliferative enteropathy is an intestinal infectious disease caused by the obligate intracellular bacterium Lawsonia intracellularis. Immunohistochemistry staining has superior sensitivity over hematoxylin and eosin and silver staining for detecting L. intracellularis in histological sections. A L. intracellularis-specific monoclonal antibody (MAb) produced in the UK (IG4 MAb) has been described in the literature. However, no monoclonal or polyclonal antibodies are commercially available. Therefore, the objective of this study was to produce and characterize new polyclonal and monoclonal antibodies against L. intracellularis that are suitable for diagnostic use. The new monoclonal (2001 MAb) and polyclonal antibodies (1999 PAb) were compared with the IG4 MAb using Western blot analysis of outer membrane proteins (OMPs) of 6 L. intracellularis isolates, Bilophila wadsworthia and Brachyspira hyodysenteriae and using immunohistochemistry of known positive and negative histologic samples and pure cultures of L. intracellularis, B. wadsworthia, B. hyodysenteriae, Salmonella choleraesuis, S. typhimurium, and Escherichia coli K88. Immunogold staining using 2001 MAb was performed to show the specificity of the antibody against an L. intracellularis surface protein. Western blot analysis showed that the 2001 MAb targeted an OMP of 77 kD, which made it different from the IG4 MAb that targeted an 18-kD OMP. The immunogold stain demonstrated the specificity of the 2001 MAb to a surface protein of L. intracellularis. The polyclonal antibody (1999 PAb) targeted 5 OMPs (77, 69, 54, 42, and 36 kD). Both the 2001 MAb and 1999 PAb stained known positive, but not negative, histologic samples. Both the 2001 MAb and 1999 PAb reacted with a pure culture of L. intracellularis but not with any other common enteric pathogens. These two new antibodies will be useful for immunodiagnosis of L. intracellularis. 相似文献
13.
Lim JJ Kim DH Lee JJ Kim DG Kim SH Min W Chang HH Rhee MH Kim S 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2012,74(2):263-265
A total of 170 fresh fecal samples (healthy; n=137, diarrheic; n=33) were collected from pet rabbits. By using PCR and formol-ether concentration method, a total 13/137 healthy rabbit feces were positive for L. intracellularis, 6/137 for Salmonella, and 13/137 for Eimeria. On the other hand, a total 17/33 diarrheic rabbit fecal samples were positive for L. intracellularis, 10/33 for Salmonella, and 21/33 for Eimeria. From these results, more than 20% of clinically normal and 97% of diarrheic rabbits were positive for single or concurrent infection of three pathogens. To the best of our knowledge, this is the first report to describe the prevalence of the microorganisms L. intracellularis, Salmonella and Eimeria in pet rabbits. 相似文献
14.
A disease challenge experiment was conducted to determine if including 10% dried distillers grains with solubles (DDGS) in the diet, with or without antimicrobial supplementation, reduces the incidence or severity, or both, of intestinal lesions in growing pigs after an Lawsonia intracellularis challenge. One hundred 17-d-old weaned pigs were blocked by sex, ancestry, and BW and randomly allotted to 1 of 5 treatment groups: negative control, unchallenged, corn-soy diet; positive control, challenged, corn-soy diet; 10% DDGS diet, challenged; positive control with antimicrobial regimen, challenged; and 10% DDGS diet with antimicrobial regimen, challenged. For antimicrobial-supplemented treatments, diets contained 33 ppm bacitracin methylene disalicylate throughout the experiment, with chlortetracycline (Aureomycin) pulsed at 550 ppm from d 3 prechallenge to d 11 postchallenge. Challenged pigs were orally inoculated with 8.0 x 10(8) L. intracellularis organisms after a 4-wk prechallenge period. On d 21 postchallenge, pigs were euthanized, lesions of intestinal mucosa were evaluated, and ileal tissue samples were analyzed by immunohistochemistry to determine the presence and proliferation rate of L. intracellularis. Compared with other dietary treatments, feeding a diet containing 10% DDGS reduced ileum and colon lesion length and prevalence (P < 0.05) and reduced severity of lesions in the ileum (P < 0.05) and colon (P < 0.10) in challenged pigs. Compared with other challenged pigs, those fed the diet containing the antimicrobial regimen had a lower prevalence and severity of lesions in the jejunum (P < 0.05) and tended to have reduced total tract lesion length (P = 0.11). Compared with other challenged pigs, pigs on the 10% DDGS diet with antimicrobial regimen exhibited no differences in length, severity, or prevalence of lesions (P > 0.15), but fecal shedding of L. intracellularis was reduced on d 14 postchallenge (P < 0.05). No dietary effects on fecal shedding were observed by d 20 postchallenge (P > 0.10). The proportion of cells infected with L. intracellularis was reduced when DDGS (P = 0.05) or antimicrobial (P = 0.10) diets were fed. Under the conditions of this experiment, dietary inclusion of 10% DDGS appears to provide some benefit to growing pigs subjected to a moderate L. intracellularis challenge, similar to those of a currently approved antimicrobial regimen. 相似文献
15.
An experiment was conducted to determine if including distillers dried grains with solubles (DDGS) in the diet of growing pigs reduces the incidence or severity of infection after a Lawsonia intracellularis challenge. Eighty 17-d-old weaned pigs were blocked by sex, ancestry, and BW and randomly allotted to 1 of 4 treatment groups: negative control (NC), unchallenged, corn-soy diet; positive control (PC), challenged, corn-soy diet; 10% DDGS diet (10D), challenged; and 20% DDGS diet (20D), challenged. Challenged pigs were orally inoculated with 1.5 x 10(9) L. intracellularis organisms after a 4-wk prechallenge feeding period. On d 21 postchallenge, pigs were euthanized, lesions of intestinal mucosa were evaluated, and ileal tissue samples were analyzed by immunohistochemistry to determine the presence and proliferation rate of L. intracellularis. Compared with unchallenged pigs, challenging pigs with L. intracellularis reduced growth rate, feed intake, and efficiency of gain (P < 0.01) and increased gauntness (P < 0.05) and diarrhea (P < 0.01). Diet did not affect growth performance postchallenge (P > 0.40). Feeding 10 or 20% DDGS diets did not reduce lesion length, prevalence, proliferation of L. intracellularis, or severity of lesions (P > 0.10). Thus, dietary inclusion of DDGS did not reduce the incidence or severity of lesions under the conditions of a severe L. intracellularis challenge used in this study. 相似文献
16.
Gonzalez-Añover P Vigo E Encinas T Torres-Rovira L Pallares P Gomez-Izquierdo E Sanchez-Sanchez R Mallo F Gonzalez-Bulnes A 《Research in veterinary science》2012,93(1):100-102
Current study aimed to determine possible differences in plasma leptin levels during the prepuberal period and their relationship with the onset of puberty in gilts of obese thrifty genotype (Iberian breed) and lean genotype (Large White × Landrace commercial crosses) reared under similar conditions. Plasma leptin concentration increased linearly during the 7 weeks prior to the day of puberty attainment in both genotypes (P<0.005, r=0.707 for LW × L and P<0.0005, r=0.874 for Iberian gilts). However, leptin levels in the Iberian gilts was higher from the first sample of the experimental period, with females having 16 weeks-old (2.7±0.3 vs 1.7±0.2 ng/ml in LW × L; P<0.001), to the onset of puberty (8.5±0.7 vs 2.8±0.3 ng/ml in LW × L; P<0.005). Thus, the current study reinforces previous data on changes in around puberty and evidences, for the first time, profound differences in prepuberal plasma leptin levels between gilts of obese (Iberian) and lean genotypes (LW×L). 相似文献
17.
The microbiota of pigs influenced by diet texture and severity of Lawsonia intracellularis infection
Mølbak L Johnsen K Boye M Jensen TK Johansen M Møller K Leser TD 《Veterinary microbiology》2008,128(1-2):96-107
Pigs with and without naturally occurring Lawsonia intracellularis infection were fed diets with different texture. In a previous study from 79 pig herds using a similar feeding on pelleted or non-pelleted form showed that the non-pelleted diet was associated with a reduced prevalence of L. intracellularis. In this study a mechanistic approach was taken for explaining and testing this observation by studying the microbiota and the occurrence of L. intracellularis in the distal ileum of 54 pigs by terminal restriction fragment length polymorphism (T-RFLP) analysis, Real-Time PCR and in situ hybridization. The texture of the diet influenced the microbiota, and from a quantitative discriminative analysis of the terminal restriction fragments (T-RFs) of ileum samples it was deduced that Clostridium spp. and Lactobacillus spp. were associated with the non-pelleted diet and Streptococcus spp. with the pelleted diet. In experimentally infected pigs it was verified that 89bp and 90bp sized T-RFs (HhaI) from ileum represented L. intracellularis. The non-pelleted diet seemed to reduce the relative amount of L. intracellularis in the total microbiota of the ileum, but the number of pigs detected positive with L. intracellularis by Real-Time PCR was not influenced. The five pigs with highest L. intracellularis content showed T-RFs that were not present in profiles from less or non-infected pigs, which may indicate that some bacterial species were associated with L. intracellularis infection. 相似文献
18.
Effects of elevated ambient temperature on puberty and related physiological responses were studied in 40 gilts. Group 1 (n = 20) gilts were born in September and Group 2 (n = 20) gilts were born in March. Gilts were placed in environmentally controlled chambers at 140 d of age. After a 10-d acclimation period at 20 degrees C, 35% relative humidity (RH), and 12 h light (L)/12 h dark (D), gilts within each group were randomly assigned to one of two treatments: control (C; 15.6 degrees C, 35% RH, 12 h L/12 h D) or heat stress (HS; 33.3 degrees C, 35% RH, 12 h L/12 h D). Daily detection of estrus with a boar began at 180 d of age and continued for 50 d. All gilts not reaching puberty by 230 d of age received 1,000 IU pregnant mare serum gonadotropin (PMSG) and 7 d later were examined by laparotomy. Rectal temperatures (REC) and respiration rates (RESP) were taken twice daily. Food intake (FI) and water usage (WC) were recorded daily. Blood samples were collected weekly and BW recorded at 150, 190, and 230 d of age. No differences (P greater than .05) were observed due to season of birth. Heat-stressed gilts had greater (P less than .001) REC and RESP and consumed more (P less than .01) water than C gilts. Food intake and ADG were not different between treatments (P greater than .05).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
19.
Em-on Olanratmanee Roongroje Thanawongnuwech Annop Kunavongkrit Padet Tummaruk 《Tropical animal health and production》2014,46(6):1001-1007
Porcine reproductive and respiratory syndrome (PRRS) virus infection causes reproductive failures including return to oestrus, abortion, mummified foetuses, stillborn, and weak-born piglets. The objective of the present study was to investigate reproductive performance of sows in PRRS-virus-seropositive herds with and without PRRS modified live virus (PRRS-MLV) vaccination. The study was conducted in 20 PRRS-virus-seropositive commercial swine herds in Thailand. The data included 211,009 mating and 180,935 farrowing records. The analysed variables included farrowing rate (FR), return rate (RR), abortion rate (AR), total number of piglets born per litter (TB), number of piglets born alive per litter (BA), percentage of stillborn (SB), percentage of mummified foetuses (MM), and number of piglets weaned per litter (WP). The results revealed that FR in non-vaccinated sows was lower than that in vaccinated sows (85.0 vs 89.7 %, respectively, P?<?0.001), and RR in non-vaccinated sows was higher than that in vaccinated sows (6.9 vs 3.7 %, respectively, P?<?0.001). AR did not differ significantly between non-vaccinated and vaccinated sows (1.6 and 2.0 %, respectively, P?=?0.964). TB (11.2 and 11.5, respectively, P?<?0.001), BA (10.0 and 10.6, respectively, P?<?0.001), and WP (9.2 and 9.6, respectively, P?<?0.001) in non-vaccinated sows were lower than those in vaccinated sows. SB (6.9 and 5.1 %, respectively, P?<?0.001) and MM (3.2 and 2.2 %, respectively, P?<?0.001) in PRRS-MLV-vaccinated sows were higher than those in non-vaccinated sows. The improvement in sow reproductive performance in PRRS-MLV-vaccinated herds was most pronounced in gilts and primiparous sows. 相似文献
20.
胎次、产仔月份及纯繁/杂交对母猪产仔性能的影响 总被引：1，自引：0，他引：1
本研究统计分析了部分非遗传因素(胎次、产仔月份及纯繁/杂交)对长白、大白和杜洛克母猪产仔性能(总产仔数、产活仔数及初生窝重)的影响,旨在为后备母猪的选种提供指导。结果表明,2~5胎仔猪的初生窝重较重;其中2、3胎的初生窝重极显著高于头胎及6胎之后的仔猪初生窝重(P<0.01)。3月份总产仔数、产活仔数及初生窝重极显著高于其他月份(P<0.01),且11月份初生窝重显著低于其他月份(P<0.05)。长白纯繁母猪在产活仔数方面极显著优于大白纯繁母猪和长白×大白杂交母猪(P<0.01);在初生窝重方面,大白×长白杂交母猪的初生窝重极显著高于大白纯繁母猪和长白×大白杂交母猪(P<0.01)。第2胎与3~4胎、第3胎与第4胎的总产仔数呈极显著正相关(P<0.01)。综上所述,该猪场母猪3~6胎的产仔性能较好,且以1~4月份的产仔性能为佳;配种方式以长白纯繁和大白×长白杂交为宜;第2胎产仔性能可作为后备母猪选留的重要依据。 相似文献