Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 9(9): 1347-1354
Http://dx.doi.org/10.17582/journal.aavs/2021/9.9.1347.1354
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Nguyen Dinh Tuong1, Tran Thi Bich Ngoc2,3*, Tran Hiep3, Pham Kim Dang3

1Nghe An University of Economics, Nghe An, Vietnam; 2National Institute of Animal Sciences, Hanoi, Vietnam; 3Vietnam National University of Agriculture, Vietnam.

Abstract | The aim of the study was to evaluate the effect of digestible lysine/metabolisable energy ratio (Dig.Lys/ME) in gilt diets on growth, age at puberty and reproductive performance. Total 72 gilts F1 [Landrace (L) x Yorkshire (Y)] of about 30 kg (75-80 day-old) were allocated equally into 3 treatments of 4 pens each (6 gilts/pen) according to a completely randomized design. Three experimental diets were formulated at low, medium and high Dig.Lys/ME ratio [2.34, 2.58, 2.81 in the period 1 (30-60 kg), and 2.03, 2.24, 2.44 in the period 2 (60 kg to first mating), respectively]. Results show that increasing in Dig.Lys/ME ratio in gilt diet increased average daily gain (ADG) (periods 30-60kg and 60kg to first estrus, and overall) and backfat thickness at first mating, and reduced the age at first estrus and first mating (P < 0.05). In overall, gilts fed diets with medium and high Dig.Lys ratio had better feed conversion raio (FCR) than gilts fed diet with low Dig.Lys/ME ratio. As a result, increasing in Dig.Lys/ME ratio in gilt diet improved reproductive performance at first parity, in terms of number of weaned piglets, birth weight, weaning weight and ADG of piglets (P < 0.05). In conclusion, the F1 (L x Y) gilts had higher reproductive performance when they were fed 2.81 and 2.44 g/Mcal Dig.Lys/ME ratio in the diet at 30-60 kg and 60kg to first mating periods, respectively.

Keywords | Backfat thicknes, Dig.Lys/ME ratio, Gilt, Reproductive performance, Period