Table 1 Effects of dietary condensed tannins or forages containing condensed tannins on nitrogen metabolism and N2O emissions from excreta in ruminants
Reference | Tannin source (plant/extract) | Animal species | DMI, production performance, or N metabolism related indicators | N excretion or N retention | N2O emissions |
|---|---|---|---|---|---|
Grainger et al. [54] | Acacia mearnsii | Grazing dairy cows | –DMI; ↓Milk yield | ↓UN; ↑FN; –N retention | NR |
Deaville et al. [47] | Mimosa tannins | Wether sheep | ↓DMI | ↓UN; ↑FN; –N retention | NR |
Hao et al. [52] | Acacia mearnsii | Beef cattle | NR | NR | –Manure N2O emissions |
Maamouri et al. [55] | Acacia cyanophylla foliage | Grazing ewes | ↓DMI; ↓Milk yield; ↓MUN | ↓UN; –FN; ↑NUE | NR |
Kronberg and Liebig [56] | Quebracho | Grazing sheep | –DMI; ↓BUN | ↓Urinary urea N | NR |
Ahnert et al. [57] | Quebracho | Heifers | –DMI; ↓CP digestibility | ↓UN; ↑FN; ↑N retention | NR |
Min et al. [58] | Pinus taeda L | Meat goats | –DMI; –CP digestibility; | –UN; –FN | NR |
Aguerre et al. [59] | Quebracho-chestnut tannin extracts | Dairy cows | ↓DMI; –Milk yield; ↑Milk/DMI; ↓CP digestibility; ↓Rumen NH3-N; ↓MUN | ↓UN; ↑FN; –NUE | NR |
Gunun et al. [60] | Antidesma thwaitesianum Muell. Arg | Goats | –DMI; –CP digestibility; –Rumen NH3-N | ↓UN; –FN; ↑N retention; ↑NUE | NR |
Pathak et al. [48] | Ficus infectoria and Psidium guajava leaf meal mixture | Lambs | ↑DMI; ↑ADG; ↑FCR; ↑Wool yield; –CP digestibility | ↓UN; ↑FN; ↑N retention; ↑NUE | NR |
Gerlach et al. [45] | Acacia mearnsii | Dairy cows | –DMI; –Milk yield; –Milk composition; ↓MUN | –UN; –FN; ↓NUE | NR |
Koenig et al. [46] | Acacia mearnsii | Beef cattle | –DMI; –ADG; –FCR; –Carcass traits; ↓BUN | ↓Manure NH3-N emissions | NR |
Koenig and Beauchemin [61] | Acacia mearnsii | Beef cattle | –DMI; ↓CP digestibility; ↓BUN | ↓Urinary urea; ↓UN; ↑FN | NR |
Zhang et al. [62] | Bayberry/Acacia mangium | Dairy cows | –DMI; –Milk yield; –Milk composition; ↓MUN; ↓CP digestibility (Acacia mangium); ↓BUN (bayberry) | ↑FN (Acacia mangium); ↓UN (bayberry); ↑N retention (bayberry); ↓N retention (Acacia mangium); | NR |
Lagrange et al. [63] | Birdsfoot trefoil and sainfoin | Grazing beef cattle | ↓BUN | ↓Urinary N concentration; ↓Urinary urea-N concentration | NR |
de Souza et al. [53] | Acacia mearnsii | Sheep | –DMI; ↓CP digestibility | ↑FN; – UN; –N retention | ↑Urine N2O emissions; –Feces N2O emissions |
Silveira Pimentel et al. [49] | Acacia mearnsii | Goat kids | –DMI; ↓FCR; ↓Carcass yield; ↓CP digestibility | ↓UN; ↑FN; –N retention | NR |
van Cleef et al. [51] | Sericea lespedeza | Beef steers | NR | NR | ↓Urine N2O emissions; ↓Feces N2O emissions; ↓Urine N2O-EF; ↓Feces N2O-EF; |
da Silva Aguiar et al. [64] | Mimosa tenuiflora hay | Lambs | ↓DMI; ↓CP digestibility | ↓UN; ↑FN; –N retention | NR |
Uushona et al. [65] | Acacia mearnsii | Lambs | ↑DMI; ↓CP digestibility; ↑Rumen NH3-N | ↑FN; –UN; ↑N retention; ↑NUE | NR |
Oliveira et al. [66] | Acacia mearnsii | Dairy cows | –DMI; –Milk yield; –Milk composition; ↓Milk UFA | –UN; –FN | NR |