Browsing by Author "VENKATARAMANAN R"
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ThesisItem Restricted GENETIC EVALUATION OF GROWTH IN FIELD FLOCKS OF MADRAS RED SHEEP USING RANDOM REGRESSION MODELS(2017) ARTHY V; TANUVAS; VENKATARAMANAN R; SIVASELVAM SN; SREEKUMAR CGrowth performance of Madras Red sheep in farmers‘ flocks was evaluated using random regression models (RRM). Data accrued over 25 years at the Network Project on Sheep Improvement - Madras Red field unit (NWPSI), jointly funded by Indian Council of Agricultural Research, New Delhi and Tamil Nadu Veterinary and Animal Sciences University (TANUVAS), Chennai has been utilised for this study. Evaluation of growth was done through univa.riate analyses, multivariate analyses and RRM and the results were compared. Univariate analyses was done for body weight at birth (BW), weaning weight (WW), 6- month weight (6W), 9-month weight (9W), 12-month weight (YW), pre-weaning (ADG1, birth to 3-months) and post-weaning average daily gains (ADG2, 3- 6 months; ADG3, 6-9 months; ADG4, 9-12 months and ADG5, 3-12 months).ThesisItem Restricted PERFORMANCE OF SOVIET CHINCHILLA RABBITS UNDER DIFFERENT FEEDING REGIMES(2022) ANANDAN N; TANUVAS; VENKATARAMANAN R; USHA S; BANDESWARAN CThe study was conducted to assess the performance of Soviet Chinchilla rabbits under different feeding regimes at Livestock Farm Complex, Madhavaram milk colony, Chennai-51. A total number of thirty Soviet Chinchilla weaned bunnies were divided into three groups vizT1: (Concentrate diet + Guinea grass), T2: (Concentrate diet + Hydroponic maize) and T3: (Concentrate diet + Hydroponic cowpea). All the animals were reared in cages under similar management conditions. Data on microclimatic variables, body weight, average daily body weight gain, average dry matter intake, feed conversion ratio, cost off odder production, cost of rabbit production/kg live weight gain,carcasscharacteristics,blood and biochemical parameters and reproductive performance were collected. At the start of the trial, the body weight (kg) of rabbits inT1,T2 and T3 were 0.82 ± 0.06, 0.70 ± 0.06 and 0.77 ± 0.07, respectively and at the end of the trial (24 weeks), were 2.15 ± 0.09, 2.37 ± 0.11 and 2.16 ± 0.10 kg, respectively. Rabbits under T2 had numerically higher body weight than T1 and T3. The overall weight gain (g) in T1, T2 and T3 were 1333.10 ± 54.84, 1673.80 ± 83.82 and 1390.60 ± 62.95, respectively which showed highly significant (P≤ 0.01) difference between the treatment groups. The rabbit fed hydroponic maize had significantly higher body weight gain than those were fed with hydroponic cowpea and guinea grass. The overall average daily gain in T1, T2 and T3 were 10.58 ± 0.44, 13.28 ± 0.67 and 11.04 ± 0.50 which showed highly significant (P≤ 0.01)differencebetween the groups. The overall daily concentrate feed intake (g) in T1, T2 and T3 were 56.60 ± 2.10, 52.00 ± 1.11 and 63.12 ± 0.97, respectively and corresponding value for green fodder intake (g) in T1, T2 and T3 were 223.67 ± 5.82, 183.95 ± 2.16 and 71.04 ± 1.41, respectively.Overall green fodder intake was significantly higher in T1 followed by T2 and T3.Overall dry matter intake from concentrate feed and green forage (g) in T1, T2 and T3 were 100.25 ± 2.39, 79.61 ± 1.27 and 64.11 ± 0.85 which differed significantly between the treatment groups. The overall feed conversion ratio in T1, T2 and T3 were 9.64, 6.12 and 5.97 where better feed conversion ratio was observed in hydroponic fodder fed groups (T2 and T3).ThesisItem Restricted RANDOM REGRESSIONS IN A BAYESIAN FRAMEWORK FOR MODELLING SEMEN PRODUCTION AND FERTILITY TRAITS IN HOLSTEIN FRIESIAN, HOLSTEIN FRIESIAN-CROSSBRED AND INDIGENOUS CATTLE(2022) AMBIKE VRINDA BINDUMADHAV; TANUVAS; VENKATARAMANAN R; KARTHICKEYAN SMK; TIRUMURUGAAN KGThe genetic potential of breeding bulls over the age of the bull was evaluated based on data on semen production (1,64,962 ejaculates), sperm abnormality (1527 ejaculates) and fertility (2,46,759 inseminations) traits collected from Bharatiya Agro Industries Foundation (BAIF) in Holstein Friesian purebred (120 bulls) and crossbreds (177 bulls) and indigenous bulls (189 bulls). The semen production traits studied were ejaculate volume (EV- ml), sperm concentration (SC- 109/ml), initial sperm motility (ISM- %), post-thaw motility (PTM- %), the total number of spermatozoa per ejaculate (TNS- 109/ejaculate), and the theoretical number of semen doses (TNSD). The sperm abnormality traits were head abnormality (HA- %), mid-piece abnormality (MA- %), tail abnormality (TA- %), and total abnormalities (A- %). Conception rate (CR- %) was the only fertility trait included which was measured as a binary trait. The performance of HF purebred and crossbred bulls was better than indigenous bulls except for ISM.ThesisItem Restricted STRATEGIC SUPPLEMENTATION ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF MECHERI SHEEP(2021) ABINESH KM; TANUVAS; SURESH KUMAR K; MURALIDHARAN J; VENKATARAMANAN RThe study was designed to assess the strategic feed supplementation on body condition score, productive and reproductive performances of Mecheri sheep. Eighty cyclic Mecheri ewes aged between 2 and 4 years belonging to Mecheri Sheep Research Station (MSRS), Pottaneri, were utilised used for this study. The animals were divided equally into control and treatment groups, each group consisting of 40 animals. The animals for each group were allotted based on body condition scoring namely < 2.5, 2.5, 3.0, 3.5 and > 3.5 with eight animals in each BCS level. The control group animals were maintained under semi-intensive system of rearing with eight hours of grazing and concentrate supplementation @ 150 grams / ewe / day for the entire trial period. The treatment group animals were maintained under strategic feed supplementation. The ewes in this group were maintained under semi-intensive system of rearing with eight hours of grazing and concentrate supplementation @ 150 grams / ewe / day for the entire trial period. Apart from the regular feed supplementation, these animals were strategically supplemented with additional 250 grams of concentrate feed 21 days before ram introduction and continued for two oestrous cycles. In addition, strategic supplementation was given during last month of pregnancy and first month of lactation. The body weight of ewes at mating and lambing was found to be statistically non-significant between the treatment groups. Age of the ewes was found to have a significant (P<0.05) effect on weight at mating and lambing. BCS at mating and lambing had a significant (P<0.05) effect on body weight of ewes between different BCS groups. The statistical analysis revealed no significant difference in birth and weaning weight of lambs born to ewes of different treatment groups. The age of ewes was found to have a significant effect (P<0.05) on birth and weaning weight of lambs. Body Condition Score at mating had a highly significant (P<0.01) effect on birth and weaning weight of lambs. Statistical analysis revealed that there was no significant effect of supplementation and age of the ewes on average weight gain during pregnancy in different treatment groups. The supplementation had a significant (P<0.05) effect on average weight gain during pregnancy between the BCS groups, with ewes in BCS group 2.5 to 3.0 had gained highest weight (6.94 ± 2.51 kg) during pregnancy. Supplementation and age of the ewes revealed no significant difference in tupping percentage, lambing percentage, duration of pregnancy and lamb survival between the treatment groups. BCS at mating had a highly significant (P<0.01) effect on tupping percentage and lamb survival and significant (P<0.05) effect on lambing percentage. The total variable cost to produce one lamb differed between the groups, the lowest cost of production of lamb was observed in control group than the supplementation group. Total kilograms of weight produced at the time of weaning differed between the groups. In supplementation group, the total kilograms of weaning weight produced was 517.5 kg and it was 440.9 kg in control group. The revenue generated from one ewe was highest in supplementation group than the control group. The results revealed that animals can be maintained under maintenance ration followed in the farm. The animals with lower BCS in a flock need to be identified and preferentially supplement them to increase the body condition score for augmenting the productive and reproductive performance.