title: Analysis of Reproductive Traits of Broiler Rabbits Reared in Sub-temperate Climate of Kodai Hills, Tamil Nadu, India.
abstract: OBJECTIVE
  The present study was carried out at Institute Rabbit Farm of Southern Regional Research Centre, Mannavanur, Kodaikanal, Tamil Nadu, India having sub-temperate climate with winter temperature during night hours going below 0°C with an objective of finding the influence of different factors such as breed, year, season and parity on different reproductive traits of broiler rabbits in order to come out with the best strategies for improving the productivity.
  
  
  METHODS
  A total of 1793 records (946 White Giant and 847 Soviet Chinchilla) for weight at mating (WM), weight at kindling (WK), gestation length (GL), litter size at birth (LSB) and litter size at weaning (LSW), litter weight at birth (LWB), and litter weight at weaning (LWW) were collected in the period between 2000 and 2009 and the data was analyzed using general linear model option of SAS 9.2.
  
  
  RESULTS
  The overall mean GL, WM, WK, LSB, LSW, LWB, and LWW were 31.68±0.04 days, 3.65±0.01 kg, 3.84±0.01 kg, 6.91±0.08, 5.49±0.09, 387.62±4.07 g, and 4.66±0.07 kg, respectively. The breed has significantly influenced GL, WK, LSW, LWB, and LWW. The LSB, LSW, LWB, and LWW were 7.05±0.11, 5.76±0.13, 399.55±5.88 g, and 4.87±0.10 kg, respectively in White Giant and corresponding values for Soviet Chinchilla were 6.78±0.11, 5.22±0.12, 375.91±5.64 g, and 4.46±0.09 kg, respectively. The year of kindling had significantly affected all the reproductive traits under study and is varying over different years. The parity significantly influenced the WM, WK, and LWW. The LWW increased from first (4.16±0.21 kg) to second parity (4.86±0.19 kg) and remained in the same range from third parity onward. WM was significantly higher in spring season (3.72±0.02) than the animals in rainy (3.59±0.02) and winter season (3.65±0.02). Better reproductive performance in terms of higher LSB, LSW, LWB, and LWW as observed in the present study might be due to conducive environmental conditions prevailing in the region.
  
  
  CONCLUSIONS
  The significant effects of the non-genetic factors like year of kindling on all reproductive traits, season, and parity on some of the traits in rabbit breeds are indications that any future production enhancement strategy must take into consideration the environment by providing additional care, feed supplementation and better shelter management to the rabbits, so that the full genetic potential can be realized.
authors.affiliation: Department of Agriculture and Animal Husbandry, Gandhi Gram Rural Institute, Gandhigram, Dindigul, Tamil Nadu, India.
authors.forename: S
authors.initials: S
authors.lastname: Rajapandi
authors.affiliation: Department of Agriculture and Animal Husbandry, Gandhi Gram Rural Institute, Gandhigram, Dindigul, Tamil Nadu, India.
authors.forename: N
authors.initials: N
authors.lastname: Ramanathan
authors.affiliation: Southern Regional Research Centre, ICAR - CSWRI, Mannavanur, Kodaikanal, Tamil Nadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Pourouchottamane
authors.affiliation: Department of Bio Statistics, Veterinary College & Research Institute (TANUVAS), Namakkal, Tamil Nadu, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Thiruvenkadan
authors.affiliation: Department of Livestock Production Management, Veterinary College & Research Institute (TANUVAS), Namakkal, Tamil Nadu, India.
authors.forename: V Ramesh Saravana
authors.initials: VR
authors.lastname: Kumar
authors.affiliation: Section of Transfer of Technology, ICAR - Central Research Institute for Dryland Agriculture,Saidabad, Hyderabad,Telangana, India.
authors.forename: P K
authors.initials: PK
authors.lastname: Pankaj
authors.affiliation: Southern Regional Research Centre, ICAR - CSWRI, Mannavanur, Kodaikanal, Tamil Nadu, India.
authors.forename: A S
authors.initials: AS
authors.lastname: Rajendiran
keywords: litter traits; parity; rabbit; reproductive performance; season; sub-temperate