The Journal of Research ANGRAU

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J.Res. ANGRAU 41(1) 51-55, 2013 POSTPARTUM OVARIAN FOLLICULAR DYNAMICS AND ESTRUS ACTIVITY IN LACTATING ONGOLE COWS K. VENKATA RAMANA, K. SADASIVA RAO, K. SUPRIYA and N. RAJANNA Department of Animal Reproduction Gynaecology & Obstetrics, College of Veterinary Science, Sri Venkateswara Veterinary University, Rajendranagar – 500 030 Date of Receipt : 06.12.2012 Date of Acceptance :28.01.2013 ABSTRACT The objective of this study was to characterize early postpartum follicular dynamics in lactating Ongole cows in relation to their ovarian activity and subsequent reproductive performance using 70 multiparous lactating Ongole cows. The follicles measuring above 6 mm diameter and corpus luteum measuring 8-10 mm were detected by day 20-25 postpartum period by ultrasonography. The first and second wave of the dominant follicle emerged on 1.80 + 0.8 and 12.46 + 0.20 days respectively. The mean growth rate and size was significant (P
RAMANA et al with small follicles measuring > 6 mm diameter. In the ultrasound monitoring follicles measuring above 6 mm diameter and corpus luteum measuring 8-10 mm were detected by day 20-25 postpartum period. The resumption of ovarian activity observed in this investigation is close to the findings of Roche et al. (1992) Henao et al. (2000). The follicular size > 6 mm reported in this study is in concurrence with the observations of Krishna mohan et al (2010) and Satheesh kumar et al (2008). However, Rajamahendran et al. (1990) reported first postpartum ovulation as early as 10-15 days postpartum in Bos indicus cows. The follicular growth pattern monitored using an ultrasound scanner during the standing estrus in ten estrus cycles revealed the occurrence of seven two wave and the other three shown three wave cycles with wave emergence on day 1.80 + 0.80 and 12.46+0.50 for two wave cycles, day 1.52 +0.03, 9.60 +0.40 and 15.20 + 0.37 for three wave cycles, respectively. The two wave pattern (7/10) of follicular growth observed in the present investigation is in close agreement with the findings of Figueiredo et al. (1997), Mayra et al. 1999), Alan et al. (2003), Borges et al. (2004), Gaur and Purohit (2007) and Akter et al. (2010) who have reported predominantly two wave pattern in the estrus cycle in Nelore or Zebu cows. On the contrary much shorter intervals were reported by Borges et al.(2001) in zebu crosses, Rhodes et al.(1995) in cross breed heifers and Malhi et al. (2005) in Hereford cows. The mean diameter of the first and second dominant follicles (10.23 +0.40 and 12.30+ 0.36 mm) of the two wave recorded in this study were in close agreement with the findings of Figueiredo et al. (1997) Mayra et al. (1997) Akter et al. (2010) in Nelore cows. Contrary to these findings Gaur and Purohit (2007) observed the lesser average diameter of dominant follicle size of 8.02 + 0.38 and 9.10 + 0.24 mm in Nelore cows for the first and second waves, respectively. However Krishna Mohan et al. (2010) also recorded higher diameter of (14.6 + 0.12 mm) than the present study in normal cyclic Sahiwal cows. It was observed that the first wave dominant follicle of three wave cycles attained a maximum size of 10.70+0.20 mm with a mean growth rate of 0.87+0.03 mm per day and in the second wave of the dominant follicle maximum size was 9.80+0.37 mm with growth rate of 0.77+0.06 per day. The third wave maximum diameter was 12.80+0.37 mm with a mean growth rate of 1.46+0.90 mm per day, which is significantly bigger and faster in growth rate than the first and second waves in the same estrous cycle. However, the growth rate of second and third waves were not significant. This could be due to larger duration of dominant higher progesterone and low pulsatile frequency of LH secretion (Wolfenson et al. 2004) The growth rate of the dominant follicle recorded in the present study were in agreement with the findings of Figueiredo et al. (1997). The variation in the diameter and growth rate of the dominant follicle reported could be due to inherent characters of the breeds. Body score condition (Rhodes et al.1995), negative energy balance, Insulin like Growth factor, inhibin and gonadotrophin hormones systemic levels Rhodes et al. 1997) altered LH pulse frequency and follicular growth. In normal two wave cycles, the first wave dominant follicle did not differ significantly in their size with ovulatory dominant follicle but it was small in size. The smaller diameter of first wave dominant follicle might be due to the fact that the first wave emerged during the period of higher progesterone production by the corpus luteum. These findings are in close agreement with the observations of Figueiredo et al. (1997), Mayra et al. (1999) and Viana et al. (2000) in Nelore cows. In the present study the progesterone concentration observed during the development of first follicular wave was between 1.48 to 2.98 ng/ml which could be a contributing factor for the smaller size of the dominant follicle of this first wave (Vinoles et al. 1999). Perusal of data revealed that, the mean maximum diameter of the ovulatory follicle was larger than the diameter of the dominant follicles of previous waves, which was in agreement with the findings of Figueiredo et al. (1997) and Mihm et al. (2006). The growth rate of ovulatory follicle in two wave cycles was 0.91+0.88 mm per day, was less than first wave follicle (0.94+0.80 mm per day), which could be due to lower plasma concentrations of progesterone and 57
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CONTENTS PART I : PLANT SCIENCE Eff
Page 5 and 6: J.Res. ANGRAU 41(1) 1-4, 2013 EFFEC
Page 7 and 8: EFFECT OF FOLIAR APPLICATION OF NPK
Page 9 and 10: J.Res. ANGRAU 41(1) 5-13, 2013 NUTR
Page 11 and 12: NUTRIENT UPTAKE BY RICE CROP UNDER
Page 19 and 20: LAKSHMI et al Fig 1. Changes in C/N
Page 21 and 22: LAKSHMI et al Changes in C/N ratio
Page 23 and 24: LAKSHMI et al Table 3. Changes in h
Page 25 and 26: J.Res. ANGRAU 41(1) 20-29, 2013 INF
Page 27 and 28: PRASAD and PRASADINI of bulk densit
Page 29 and 30: PRASAD and PRASADINI to as high as
Page 31 and 32: PRASAD and PRASADINI Table 4 . Infl
Page 33 and 34: PRASAD and PRASADINI Table 8. Influ
Page 35 and 36: J.Res. ANGRAU 41(1) 30-38, 2013 GEN
Page 37 and 38: VEMANNA et al The range in mean val
Page 39 and 40: VEMANNA et al grain yield per plant
Page 41 and 42: VEMANNA et al 41
Page 43 and 44: VEMANNA et al Singh, S. P and Khan,
Page 45 and 46: RAMANA et al RESULTS AND DISCUSSION
Page 47 and 48: J.Res. ANGRAU 41(1) 42-46, 2013 A S
Page 49 and 50: RAJANNA et. al. Table 2. Reasons fo
Page 51 and 52: RAJANNA et al the present findings
Page 53 and 54: NARASIMHA et al Table 1. Proximate
Page 55: NARASIMHA et al Maynard, L., Lossli
Page 59 and 60: RAMANA et al Characteristics of fol
Page 61 and 62: Research Notes J.Res. ANGRAU 41(1)
Page 63 and 64: KIRTHY et al Akhtar et al., 2008; S
Page 65 and 66: KIRTHY et al El Gharras H. 2009. Po
Page 67 and 68: SANDYARANI et al Weed parameters li
Page 69 and 70: SANDYARANI et al Table 2. Influence
Page 73 and 74: KUMAR et al Table 2. Effect of seed
Page 77 and 78: DEEPAK et al Table 2 Price spread a
Page 81 and 82: YAMINI et al Table 3. Estimates of
Page 83 and 84: YAMINI et al coupled with high per
Page 85 and 86: LOKESH et al Table 1. Clustering pa
Page 87 and 88: LOKESH et al Table 4. Mean values o
Page 89 and 90: ABIRAMI et al Socio-economic Impact
Page 91 and 92: ABIRAMI et al socio-economic impact
Page 95 and 96: VEMANNA et al Table 1. Discriminant
Page 97 and 98: VEMANNA et al total biomass, fresh
Page 99 and 100: RAO et al Table 1. Plant height, nu
Page 103 and 104: DEVI et al S.No Category Frequency
Page 105 and 106: DEVI et al extension contact and ma
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NIRMALA and VASANTHA earliness in a
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NIRMALA and VASANTHA adopted this t
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SUDHARANI et al Table 1. Genotypic
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SUDHARANI et al At genotypic level,
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NIRMALA et al weight of pods per pl
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NIRMALA et al Table 3. Cluster mean
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Research Notes J.Res. ANGRAU 41(1)
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PUNYAVATHI and VIJAYALAKSHMI 6.5 6.
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PUNYAVATHI and VIJAYALAKSHMI REFERE
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KATTEL et al Table 1. Item Analysis
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RADHIKA et al Thus, the results of
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RAJU et al estimated daily dietary
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RAJU et al Table 3. Physico-chemica
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MINNIE et al Table 2. Estimates of
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Statement about ownership and other
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GUIDELINES FOR THE PREPARATION OF M
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ESSENTIAL REQUIREMENTS FOR CONSIDER
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