Malaysian Applied Biology Journal

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30-1&2-11

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Malays. Appl. Biol. (June & December 2001) 30(1&2): 81-92

THE REPRODUCTIVE PATTERN OF HIPPOSIDEROS LARVATUS AND CYNOPTERUS HORSFIELDI FROM AN AGRICULTURAL HABITAT

T.W. TAY1, M.T. MARINA1, C.H. WONG1, A. ZUBAID2 and A.B. KAMIS1

1 School of Biosciences & Biotechnology 2 School of Environmental & Natural Resource Sciences, Faculty of Science & Technology,
Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia.

ABSTRACT

The reproductive pattern of an insectivorous bat (Hipposideros larvatus) and a frugivorous bat (Cynopterus horsfieldi) from an agriculture area, Kuala Perlis (6° 26' N, 100° 8' E), Peninsular Malaysia, is described. Insectivorous bats were sampled monthly from January 2000 to January 2001, while frugivorous bats were collected from April 2000 to March 2001. Microscopic observation of the seminiferous tubules and ductus epididymides in both species of male bats showed that they were synchronized in the presence or absence of spermatozoa. In H. larvatus, the presence of spermatozoa was only detected from May to September and the same goes for Graafian and corpus luteum follicles. For C. horsfieldi, the spermatogenesis process occurred throughout the study period but there were certain months where the presence of spermatozoa was not detected in seminiferous tubules. The former was found to show a restricted seasonal monoestry and had a synchronous reproductive pattern, with copulation immediately followed by fertilization and pregnancy. The gestation period was three months and the left uterine horn was dominant. While in the latter, female bats possessed a bilaterally functional reproductive system, whereby implantation can occur on either side of the uterine horn. The reproductive pattern of this species was seasonally polyoestrous with a gestation period of three months. This species had two reproductive seasons (October-December and March-May) in a year with each female produced one litter from each pregnancy.


ABSTRAK

Kajian terhadap corak pembiakan kelawar pemakan serangga (Hipposideros larvatus) dan kelawar pemakan buah (Cynopterus horsfieldi) di kawasan pertanian Kuala Perlis, Semenanjung Malaysia (6° 26' N, 100° 8' E) telah dilakukan. Kelawar pemakan serangga telah ditangkap setiap bulan dari Januari 2000 hingga Januari 2001, sedangkan kelawar pemakan buah ditangkap dari April 2000 hingga March 2001. Pemerhatian terhadap tubul seminiferus dan duktus epididimis dibawah mikroskop telah menunjukkan adanya keselarasan kehadiran sperma pada kelawar-kelawar ini. Pada H. larvatus kehadiran sperma hanya dapat dikesan pada bulan Mei hingga September, begitu juga dengan folikel Graaf dan korpus luteum. Corak pembiakan kelawar ini adalah monoestrus bermusim yang terselaras dengan kopulasi diikuti oleh pensenyawaan dan pembuntingan. Tempoh bunting kelawar pemakan serangga ini ialah tiga bulan dan tanduk uterus sebelah kiri adalah dominan. Sementara itu, spermatogenesis pada C. horsfieldi pula terjadi pada setiap bulan sepanjang tempoh kajian dan kelawar betina spesies ini mempunyai sistem pembiakan bilateral iaitu implantasi boleh berlaku di salah satu tanduk uterus. Corak pembiakan C. horsfieldi ialah poliestrus bermusim dengan tempoh bunting selama tiga bulan. Spesies ini membiak dalam dua musim setiap tahun (Oktober-Disember dan Mac-Mei) dengan setiap betina menghasilkan seekor anak setiap kali bunting.

Key words: Reproduction, bats, H. larvatus, C. horsfieldi, monoestrous, polyestrous

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