Morphometric evaluation of fetal stomach in alpaca (Vicugna pacos)

• Wilian Flores-Tintaya Universidad Nacional Micaela Bastidas de Apurímac, Escuela Académico de Medicina Veterinaria y Zootecnia. Abancay, Apurímac, Perú
• Ulises Sandro Quispe-Gutiérrez Universidad Nacional Micaela Bastidas de Apurímac, Facultad de Medicina Veterinaria y Zootecnia, Departamento Académico de Medicina Veterinaria y Zootecnia. Abancay, Apurímac, Perú
• Gizely Alva-Villavicencio Universidad Nacional Micaela Bastidas de Apurímac, Facultad de Medicina Veterinaria y Zootecnia, Departamento Académico de Medicina Veterinaria y Zootecnia. Abancay, Apurímac, Perú
• Miluska Beatriz Navarrete-Zamora Universidad Nacional Mayor de San Marcos, Facultad de Medicina Veterinaria, Laboratorio de Anatomía Animal y Fauna Silvestre. Lima, Perú

DOI: https://doi.org/10.52973/rcfcv-e32101

Keywords: Anatomy, gastric compartment, alpaca fetus, South American camelid, gestation

Abstract

The raising of alpacas (Vicugna pacos) in Peru constitutes one of the most resources for the survival and food security of the high Andean inhabitants. The digestive anatomy of the alpaca is not yet fully described to explain the physiological and nutritional processes. To describe the structure of the fetal stomach of the alpaca, six fetuses of Huacaya alpacas obtained from the slaughterhouse, distributing two fetuses (male and female) for each third of gestation. The fetuses were dissected exposing the stomachs, measurements of the length and width of the three compartments (C) were made, and the sulci and cells of C1 were also described. The analysis of variance was carried out considering the effect of sex, gestational age, C and their interactions, whose response variable was the length and width of the stomach C. There was no interaction (P>0.05) for any of the study variables. The length and width of the three Cs of the fetal stomach were similar in males and females (P>0.05). The length and width of the C were smaller (P≤0.05) in the first third of pregnancy, increasing the measurements in the second and last third of the pregnancy. The length of C3 was greater (P≤0.05) than C1 and C2, while the width of C1 was greater (P≤0.05) than C2 and C3. In C1 of the dorsal sac, there were more perpendicular furrows and cells in the last third of gestation. In conclusion, the sizes of the C of the fetal stomach of the alpaca increased as gestational age advanced. Furthermore, in C1, there were more perpendicular furrows and cells in the last third of gestation.

References

ABUAGLA-BADI, I.A. Morphological and Histochemical Studies on the Stomach with special emphasis on the Glandular Sacs of the Camel (Camelus dromedarius). Sudan University of Science and Technology. Tesis de Grado. Pp 90. 2014.

ABUAGLA, I.A.; ALI, H.A.; IBRAHIM, Z.H. Gross Anatomical and Histometric Studies on the Stomach Glandular Sacs of the Dromedary Camel (Camelus dromedarius). Sudan J. Sci. Technol. 15(1): 46-56. 2014.

ALZOLA, R.H.; GHEZZI, M.D.; GIMENO, E.J.; LUPIDIO, M.C.; CASTRO, A.N.; RODRÍGUEZ, J.A. Topography and morphology of the llama (Lama glama) stomach. Int. J. Morphol. 22(2): 155-164. 2004.

BARONI-CASAS, M.F.; SUÁREZ-DIAZ, H.G. Anatomía del estómago de la alpaca (Vicugna pacos, Linnaeus 1758). Universidad de la República Uruguay. Tesis de Grado. Pp 19-27. 2017.

CASTRO, A.N.C.; DÍAZ, M.C.; MENDOZA-TORRES, G.J.; LLERENA-ZAVALA, C.A.; GHEZZI, M.D.; BARBEITO, C.G. Morphology of alpaca (Vicugna pacos) embryos in the first third of pregnancy. Reprod. Domest. Anim. 53(3): 655-666. 2018.

EERDUNCHAOLU, K.; TAKEHANA, K.; KOBAYASHI, A.; BAIYIN, M.; CAO, G.F.; ANDRÉN, A.; IWASA, K.; ABE, M. Morphological Characterization of Gland Cells of the Glandular Sac Area in the Complex Stomach of the Bactrian Camel (Camelus bactrianus). Anat. Histol. Embryol. 28: 183-191. 1999.

FERRER, M.S.; JONES, M, ANDERSON, D.E.; LARSON, R. Ultrasonographic parameters of fetal well-being and development in alpacas. Theriogenol. 79(9): 1236-1246. 2013.

FOWLER, M.E. Camelids Are Not Ruminants. Chapter 46. In: Fowler, M.E.; Miller E.R. (Eds). Zoo and Wild Animal Medicine: Current Therapy. 6th Ed. Saunders Elsevier, St. Louis, USA Pp 375-385. 2007.

GAZITÚA, F.J.; CORRADINI, P.; FERRANDO, G.; RAGGI, L.A.; PARRAGUEZ, V.H. Prediction of gestational age by ultrasonic fetometry in llamas (Lama glama) and alpacas (Lama pacos). Anim. Reprod. Sci. 66(1-2): 81-92. 2001.

GOOGLE MAPS. 2021. Coordenadas de ubicación. En línea https://www.google.com/maps. 23/06/2021

INFOSTAT. Software Estadístico Versión 2008. Grupo InfoStat, FCA, Universidad Nacional de Córdoba, Argentina. 2008.

KALENBERG, C.A.; STOFFEL, M.H. The embryonic development of the bovine stomach revisited. Anat. Histol. Embryol. 49(2): 270-280. 2019.

MELLE, L. Observation of Fetal Development in Alpacas At Specific Gestational Ages Using Ultrasound, Fetal Dissection, and Computer Aided Tomography Techniques. Capstone Experiencie Manuscript. University of Massachusetts. Pp 1-58. 2011.

OUAJD, S.; KAMEL, B. Physiological Particularities of Dromedary (Camelus dromedarius) and Experimental Implications. Scand. J. Lab. Anim. Sci. 36(1): 19-29. 2009.

PÉREZ, W.; KÖNIG, H.E.; JERBI, H.; CLAUSS, M. Macroanatomical aspects of the gastrointestinal tract of the alpaca (Vicugna pacos Linnaeus, 1758) and dromedary (Camelus dromedarius Linnaeus, 1758). Vertebr. Zool. 66(3): 419-425. 2016.

SONFADA, O.B. Gross Embryonic Diffrentiation of the Stomach of the One Humped Camel (Camelus dromedarius). Anat. Physiol. 04(01): 23-30. 2013.

VALLENAS, A.; STEVENS, C. Motility of the llama and guanaco stomach. Am. J. Physiol. 220(1): 275-282. 1971.

VATER, A.; MAIERL, J. Adaptive Anatomical Specialization of the Intestines of Alpacas Taking into Account their Original Habitat and Feeding Behaviour. Anat. Rec. 301(11): 1840-1851. 2018.

VATER, A.L.; ZANDT, E.; MAIERL, J. The topographic and systematic anatomy of the alpaca stomach. Anat. Rec. 304: 1999–2013. 2021