Effects of restricted feeding during the rearing period and of induced molting during the laying period on the economical profit in the laying hens [Japan]

• Published in: Japanese poultry science Vol. 24; no. 4; pp. 244 - 252
• Main Authors: Shirasaki, K. (Kagoshima-ken. Poultry Experiment Station, Sendai (Japan)), Kashiwagi, S
• Format: Journal Article
• Language: Japanese; English
• Published: Japan Poultry Science Association 25.07.1987
• Subjects: ALIMENT POUR ANIMAUX; ALIMENTACION AD LIBITUM; ALIMENTACION RACIONADA; ALIMENTATION A SATIETE; ALIMENTATION RATIONNEE; CRIA DE AVES DE CORRAL; EGGS; ELEVAGE DE VOLAILLES; EMPRESAS; ENTERPRISES; ENTREPRISE; FEEDS; GANANCIAS; HUEVOS; JAPAN; JAPON; MOULTING; MUDA; MUE; OEUF; PIENSOS; POULTRY REARING; PRECIOS; PRICES; PRIX; PROFIT; RESTRICTED FEEDING; UNRESTRICTED FEEDING
• ISSN: 0029-0254
• DOI: 10.2141/jpsa.24.244

A profit of egg production of hens reared by 14 feeding types was calculated by following equation (1), and compared to find profitable feeding program. Profit (hen/year)=egg yield1) (kg)×price of egg (kg) + hen weight1) (kg)×price of hen (kg) -feed intake of hen1) (kg)×price of feed (kg) - cost for replacer1), 2) (\)…(1) 1) All the data are averages per hen per year calculated from the data during about 5 years of cycle. 2) Cost for replacer= starter feed intake1, 3) (kg)×price of starter feed (kg) + grower feed intake1, 3) (kg)×price of grower feed (kg) + number of day-old chicks1)×price of chick (kg) 3) The starter feed was fed until 4 weeks of age and the grower feed was fed from 5 to 20 weeks of age. In the calculation of profit, hens were intended to replace at a certain age which was called as all-out age, and a certain times during about 5 years. The profit obtained in these cycles during about 5 years was converted to the profit per hen per year for comparison among the feeding types. Calculation was done at all-out ages from 52 to 128 weeks of age with 2 weeks of interval, and also at each of 26 dates of the start of feeding in the first year with 2 weeks of interval. The calculation was done under the 5 conditions of prices for eggs and feeds as shown in the following table. 1) Prices of day-old chicks 210.4bird, srarter feed 78.47kg, culledhen 63.5kg An electronic computer FACOM 230-48 Computer was used in the calculation. The profitable feeding type and all-out weeks of age for each feeding program during the rearing period are as follows. Under the use of full-feeding program for rearing pullets: There are two profitable feeding types. One is to conduct forcedmolting at 56 weeks of age and the other is to do it twice at 56 and 96 weeks of age. There was no significant difference in profit between two feeding types when the condition of the prices are either No.1 or No. 2. In contrast, there was a significant difference in profit between two feeding types when the condition of the prices is higher than No. 3. Under these conditions, the program forced-molting once at 56 weeks of age, was more profitable than that forced-molting twice at 56 and 96 weeks of age. Under the program forced-molting at 56 weeks of age the range of suitable (profitable) all-out weeks of age was 93.4-92.5 for all condition of the prices. Difference in the conditions of the prices had little effect on the suitable all out weeks of age. Under the use of restricted feeding program for rearing pullets: The most profitable program was conducting forced-molting at 80 weeks of age for all condition of prices. The range of suitable all-out weeks of age was 115.7-111.6 for all the conditions. Again, difference in the condition of the prices had little effect on the suitable all-out weeks of age.