Effects of day of gestation and feeding regimen in Holstein × Gyr cows: I. Apparent total-tract digestibility, nitrogen balance, and fat deposition

Journal of Dairy Science
P P RottaL H R Silva

Abstract

This study investigated how feeding regimen (FR) alters apparent total-tract digestibility, performance, N balance, excretion of purine derivatives, and fat deposition in Holstein × Gyr cows at different days of gestation (DG). Forty-four pregnant multiparous Holstein × Gyr cows with an average initial body weight of 480±10.1 kg and an initial age of 5±0.5 yr old were allocated to 1 of 2 FR: ad libitum (AL; n=20) and maintenance level (ML; n=24). Maintenance level was considered to be 1.15% of body weight on a dry matter (DM) basis and met 100% of the energy requirements, whereas AL provided 190% of total net energy requirements. Data for hot and cold carcass dressing, fat deposition, average daily gain, empty body gain, and average daily gain without the gravid uterus were analyzed as a 4×2 factorial design. Intake, apparent total-tract digestibility, N balance, urinary concentration of urea, and purine derivatives data were analyzed as repeated measurements taken over the 28-d period (122, 150, 178, 206, 234, and 262 d of gestation). Cows were individually fed a corn silage-concentrate based diet composed of 93% roughage and 7% concentrate (DM basis) as a total mixed ration. Pregnant cows were slaughtered on 4 different DG: 1...Continue Reading

References

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Citations

Aug 5, 2016·Journal of Animal Physiology and Animal Nutrition·T R S GionbelliM P Gionbelli
Sep 4, 2017·Journal of Dairy Science·J R R DóreaL E Armentano
Jul 8, 2020·PloS One·Anna Luiza Lacerda SguizzatoPolyana Pizzi Rotta
Oct 13, 2017·Journal of Animal Physiology and Animal Nutrition·T R S GionbelliM P Gionbelli
Jan 20, 2020·Journal of Dairy Science·Anna L L SguizzatoPolyana P Rotta

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