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Lala Lajpat Rai University of Veterinary & Animal Sciences, Hisar

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2005 - 20082
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Subject: Animal Physiology × End date: 2009 × Start date: 2004 ×
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    Induction of cyclicity in Murrah buffalo-heifers during summer season using different hormonal treatments
    (LUVAS, 2008) Virendar Singh; Malik, R.K.
    The present study was conducted on twenty four non-cyclic Murrah buffalo-heifers between age of 25 to 38 months and body weight >300kg to investigate the effect of different hormonal regimens in anestrus buffalo-heifers during summer season. All the animals were housed in commercial half covered pucca sheds with asbestos cement sheet roofs. They were stall fed collectively with sufficient quantity of green fodder and concentrates according to their individual requirements. Showering of animals was also done 1-2 times a day during the period of experiment. These experimental animals were randomly divided into four equal groups (A, B, C & D) having six heifers in each group. Group A was kept as control where as Group B received CIDR+Folligon+Chorulon; Group C (Folligon+Receptal-Vet + Vetmate + Receptal - Vet) and Group D (Duraprogen + Progynon depot + Vetmate + Folligon). All (100%) animals in Group B and C exhibited behavioural estrus symptoms whereas majority (66.66%) Group D and only (33.33%) Group A exhibited behavioural estrus symptoms. The estrus induction percentage in Group A, B, C & D was 33.33, 100, 16.66 and 66.66%, respectively. The mean interval to estrus from withdrawal of treatment in three treatment groups B, C and D was 38.40±4.49, 66.00±30.00 and 72.00+19.60 hours, respectively. The duration of estrus was maximum (28.20±6.12) hour in Group B animals, followed by 27.75±7.08, 17.00±2.52 and 16.00±2.00 hours in Group C, D and A, respectively. The pregnancy rate at induced estrus was highest (50.00%) in Group B animals followed by 33.33%, 20.00% and 16.66% in Group D, C and A heifers, respectively. The treatment cost per estrus induction was highest (Rs. 1061/-) in Group B heifers followed by Rs. 1011/- and Rs. 651/- in Group C and D, respectively. Group D treatment was most cost effective (Rs. 1302/-) followed by Rs. 2122/- per pregnancy and Rs. 4042/- per pregnancy in Group B and C, respectively on comparison of the pregnancy rates. From the present study it can be concluded that Duraprogen + Progynon depot+ PGF2α+PMSG (Group D) treatment is cost effective for induction of cyclicity and pregnancy at induced estrus in non-cyclic, post pubertal Murrah buffalo-heifers in summer season. However, it is suggested to extend the present investigation on large number of animals before final recommendation could be made for field application.
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    Studies on ovarian follicular dynamics during early postpartum period, anestrus condition and hormonal therapies for induction of estrus in murrah buffaloes (Bubalus bubalis)
    (LUVAS, 2005) Malik, Rakesh Kumar; Pardeep Singh
    Resumption of postpartum ovarian activity is essential for continued cycle of reproduction in order to achieve maximum lifetime production from dairy animals. However, in buffaloes, this period is often intercepted by long periods of ovarian quiescence with serious economic consequences. Therefore, the phenomenon of ovarian follicular turnover during early postpartum period (day 12 - 78) was studied in 12 Murrah buffaloes at an organised farm with alternate day transrectal ultrasonography of ovaries. The study revealed that though the dynamic follicular turnover continued in wave pattern during the early PP period, it was largely suppressed. As the postpartum period increased, the mean diameter of DF in a wave also showed significant progressive increase from 7.40±0.44 mm during <30 days pp to 11.02±0.71 mm in > 60 days pp. Yet, only 3/12 buffaloes ovulated during the period, indicating high incidence of postpartum anestrus – as also indicated by basal plasma progesterone profiles. Maximum diameter of the ovulating follicle was 13.03±1.06 mm with growth rate of 0.83±0.05mm/day and interval from wave emergence to ovulation was 14.0±1.6 days. A total of 52 anovulatory waves were recorded with maximum diameter of DF being 10.24±0.26 mm and growth rate of 0.65±0.02 mm/day. Second part of the study involved assessment of two estrus induction protocols – Crestar-eCG and Ovsynch-Plus (eCG-GnRH-PGF2α-GnRH-FTAI) in two groups of anestrus buffaloes with PP intervals of around 2 or 8 months. Crestar treatment initially exerted a suppressive effect on follicular profiles, but implant withdrawal was followed by accelerated follicular growth, aided by eCG administered at implant withdrawal, leading to ovulations in 14/15 treated buffaloes. Ten buffaloes conceived at induced estrus and three more at subsequent inseminations. Ovsynch-Plus treatment was not so successful. Though ovulations were recorded in all treated buffaloes in response to the first GnRH following initial eCG, but some resulting CL were short-lived leading to lower synchrony of ovulations following 2nd GnRH and lower conception rate of 20% (3/15) to fixed timed inseminations. In conclusion, the problem of postpartum anestrus is rampant in buffaloes due to failure of ovulations in DFs, though it can be managed with suitable hormonal therapies like Crestar+eCG.