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ThesisItem Open Access Comparative feed efficiency of crossbred jersey and crossbred brown swiss cattle(Department of Nutrition, College of Veterinary and Animal Sciences, Mannuthy, 1989) Devasia, P A; KAU; Ananthasubramaniam, C RA comparative evaluation of the feed conversion efficiencies of crossbred Jersey and crossbred Brown Swiss cattle of Kerala involving a growth SLudv and a lactation stud} using eight heifer calves and six milch cows each for 28 and 14 fortnights respectively were carried out. While records 01 dailv feed intake water consumption, fortnightly data on bod\ weight, bodv measurements and monthly data on haematological values were maintained during the growth study, data on aailv feed intake milk vield, fortnightly data on composition of mill<, bod\ weight and haematolo gical values were gathered during the lactation stua\. Digestion cum-balance trials were carried out during the 14th and 28th fortnights respectively under growth studv and during the 11th fortnight under lactation studv There were no significant difierences between crossbred Jersey and crossbred Brown Swiss heifer calves in respect of their average daily dr\ matter and water consumptions, various body measurements, haematological values and digestion coefficients of various nutrients in their feed throughou the experimental period of 28 fortnights except that the average digestion coefficients of crude fibre in crossbred Brown Swiss heifer calves during digestion trial I was significantly nigner (P _/0.01) than that of crossbred Jersey Both the groups of heifer calves did not differ sigmficahtly in respect of heir average dailv consumptions of dr> matLer, gross energ} total digestible nutrients, digestible energy crude protein and digestible crude protein per unit metabolic body size (W / ). The feed conversioKB n efficiency values as adjudged m terms of quantities of dry matter, gross energy, total digestible nutrients, digestible energy, crude protein and digestible crude protein needed per kg body weight gain in crossbred Jersey were 13.70+1.01 kg, 54.25_+3.13 Meal, 8.09+0.46 kg, 36.32+2.09 Meal, 1.83+ 0.10 kg and 1.10_+0.06 kg respectively and the same were not significantly different from the average values of 14.80_+1.06 kg, 61.47+4.47 Meal, 9.17+_0.68 kg, 41.19+3.00 Meal, 2.03_+0.14 kg and 1.24^0.08 kg respectively observed in the case of crossbred Brown Swiss heifer calves. Both the groups did not differ significantly m respect of average daily nitrogen retention of 18.48_+0.61 and 18.06_+1.02 g respectively during trial I and 17.90_+1.02 and 18.86+1.13 g respectively during trial II. 0 75 Milch cows belonging to both the genetic groups of crossbred Jersey and crossbred Brown Swiss not only maintained their body weight but also showed an overall average fortnightly weight gain of 1.44+0.14 and 1.71+0.06 kg respectively without any significant difference between them in this regard. They also failed to show any significant difference in respect of feed consumption, digestion coefficients of nutrients and nitrogen retention, the marginally positive nitrogen balance together with normal haematological values obtained in respect of both the groups indicated that all the animals were m good nutritional status. The average daily milk yields of 7.28, 7.06 and 6.43 kg respectively during the 1st, 7th and 13th fortnights in the case of crossbred Jersey cows were not significantly different from those of 7.07, 7.08 and 6.80 kg respectively in the case of crossbred Brown Swiss cows There was no significant difference between cows belonging to the two genetic groups in respect of their average daily consumption of DM, gross energy, TDN, crude protein and DCP per unit metabolic body size. The overall average consumptions of 5.76_+0.23 Meal, 0.76_+0.03 kg, 3.17+0.13 Meal and 103.45+4.60 g respectively of gross energy, total digestible nutrients, digestible energyand DCP per kg of FCM produced by crossbred Jersey cows including their maintenance requirements were not significantly different from 5.87^0.25 Meal, 0.77+0.03 kg, 3.28+0.14 Meal and 104.98_+4.60 g respectively of the same by crossbred Brown Swiss cows. The two crossbred groups of milch cows failed to show any significant difference in respect of their economic efficiency in terms of dairy merit as well as income over feed cost, the average values being 22.74+0.88 and Rs 39.20 per day for crossbred Jersey and 22.59_+0.89 and Rs 39.12 per day for crossbred Brown Swiss cows respectively. No significant differences were observed in the performances of crossbred Jersey and crossbred Brown Swiss cattle in respect of their growth and milk production when reared in the same locality under identical conditions of feeding and management.