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ThesisItem Open Access Comparative study of genotype environment interactions in sesame(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1989) Mini, C J; KAU; George, K CThe present study has been conducted to choose a consistent variety for all the regions and all seasons in the light of genotype-environment interaction with the following objectives. (i) to evaluate the existing techniques available for studying GE interaction in sesame (ii) to develop new concepts and methods to solve some problems peculiar to crop sesame like non-linearity of interactions, non-orthogonality of data and different patterns of genotype-environment (GE) interactions that are encountered while studying the stability of varieties simultaneously for several traits.ThesisItem Open Access Statistical approach on the pattern of development of shank length in ducks(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1989) Sunanda, C; KAU; George, K CThe present investigation entitled ‘‘statistical approach on the pattern of development of shank length in Ducks’’ has been undertaken to study the following objectives. 1. To examine the pattern of development of shank length in two breeds of ducks in University Duck Farm, Mannuthy. 2. To compare them (a) between genetic group (b) between males and females within each genetic groups (c) between males of genetic group (d) between females of genetic group and 3. To fit appropriate growth curves for prediction of body weight through shank length at different stages of growth. For this purpose shank length and body weights on 14 males and 25 females of Desi ducklings and 26 males and 26 females of White Pekin (WP) ducklings were utilized. The ducklings were reared for twelve weeks in Kerala Agricultural University Duck Farm, Mannuthy under uniform feed formula and identical management practices. In the day old and the twelfth week of age uniformity could be seen in the mean shank length of the four groups. But at the fourth and eighth week of age, mean shank length of the four groups was not uniform. Upto ninth week of age, Desi females had higher shank length than the other three groups except at the fifth week. But during the fifth, tenth, eleventh and twelfth week of age Desi males had the highest shank length. The least shank length was always observed for WP males. During the entire period, Desi ducklings had higher shank length than WP duckling. The growth pattern of body weight was not uniform in the four groups except the initial body weight. High correlation was found between the body weight and shank length. It revealed that shank length can be made a criterion for selection for higher body weight. The method of comparison of growth rates recommended by Rao (1958) was found unsuitable for the present study. Among the functional relationships worked out linear, exponential and second degree equations were found to be unsuitable for fitting shank length as a function of age. Modified exponential, logistic, Gompertz and Von-Bertalanffy equations were found to be suitable for fitting shank length over a period of time. Among these four, Gompertz was found to be the best fit. The second best fitted equation was logistic. Graphs of the best fitted equations ie. Gompertz and logistic were drawn for all the six group along with the observed values. This also confirms above result. Among the two functional relations ie. linear and exponential used for predicting body weight from shank length, exponential was found to be most suitable.ThesisItem Open Access Comparative study of genotype environment interactions in Sesame(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1989) Mini, C J; KAU; George, K CThe present study has been conducted to choose a consistent variety for all the regions and all seasons in the light of genotype-environment interaction with the following objectives. (i) to evaluate the existing techniques available for studying GE interaction in sesame (ii) to develop new concepts and methods to solve some problems peculiar to crop sesame like non-linearity of interactions, non-orthogonality of data and different patterns of genotype-environment (GE) interactions that are encountered while studying the stability of varieties simultaneously for several traits.ThesisItem Open Access Divergence analysis of morphological and quality traits in sugarcane(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1989) Santhi, T E; KAU; Saraswathy, PMultivariate analytical techniques are found to be very useful in plant breeding research to explain the influence of various factors on the phenomenon under study. Factor analysis is found to be an appropriate tool to identify the factors of genetic divergence. D2 – analysis is helpful to group the divergent genotypes into various clusters when measurements on a number of related characters are available on a large number of genotypes such that the genotypes within a cluster are homogeneous with respect to these characters and heterogeneous between the clusters. The present study is aimed at identifying the factors of divergence in relation to morphological and quality traits in forty eight clones of sugarcane. The fifteen clones T.67172, Co.7717, Co.419, Coc.779, Co.7219, Coc.777, Ic.225, Co.6304, S - 99, Coc.773, Coc.772, Co.62198, Co.62101, Coc.778 and S – 77 are able to group into one cluster. Four more clusters are able to form respectively with five varieties (Co.658, Co.62175, S – 105, Co.6907, Co.995) in the second cluster, nine (F.1 – 2, Co.62174, S – 87, KHS 3296, Coc. 671, Co.7704, Co.785, CoM.7114, CoM.7125) in the third, seven (Co.6807, Co.1340, Co.527, S – 33, Co.6806, B. 37172, Co. 527 – M – 10) in the fourth and four varieties (Co.1307, CoA.7602, Coc.705, Co.453) in the fifth cluster. The remaining clones are not able to group. Among these clusters are utilized for factor analysis. A factor related to quality is extracted as the first factor in all the three clusters. The characters pol at 12th month, C.C.S. percentage, brix at 12th month, purity percentage and sugar yield per plot dominated this factor. Among these characters pol at 12th month, C.C.S. percentage and brix at 12th month are found to be more amenable to changes due to selection. The second factor is identified by the characters cane yield per plot, shoot count germination count and number of millable canes. Apart from these characters weight of cane is also included in this factor in cluster 1. The characters which are more amenable to change due to selection are cane yield per plot and shoot count. The characters are not common in the remaining four factors. These six factors are able to explain 66.84 percent, 79.44 percent and 87.41 percent of variation respectively in the first, third and fourth cluster.ThesisItem Open Access Biennial tendency among coconut hybrids- a statistical study(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1989) Lathy, K S; KAU; Saraswathy, PThe present study deals with the objective of estimating the magnitude of biennial tendency among coconut hybrids and WCT and to test for their significance. Non parametric and parametric approaches were tried for the study. The intensity of crop fluctuations was also estimated. The magnitude of biennial tendency was 100 per cent, 52.26 per cent and 84.34 per cent respectively for the WCT palms taken from RARS, Pilicode; RARS, Kumarakam and CRS, Balaramapuram. 100 per cent bienniality was observed for the WCT palms which were subjected to NPK manuring and for the hybrid varieties NCD, LO x GB and CC x GB palms. 97.59, 94.12, 80, 83.33, 80, 71.42, 66.67, 95.69, 88.89 and 25 per cent of the palms of WCT x CDG, WCT x GB, AO x GB, Java x GB, LS x GB, T x G, T x SS, T x D, T x GB and komadan exhibited biennial tendency. T x AD and T x LD palms showed only 14.29 per cent bienniality. Intensity of crop fluctuations was less than 50 per cent for almost all these varieties. The distribution of palms in the ‘on’and ‘off’ phase also established the existence of biennial tendency. The test of significance of biennial tendency established the existence of biennial tendency established the existence of biennial tendency among all the WCT and hybrid palms except for T x AD and T x LD. The time-trend was not found to be a significant characteristic for almost all the varieties. WCT palms which were subjected to fertilizer management during the period of the study and WCT x cdg palms were found to be influenced by both the time-trend and biennial tendency.
